I just found this update on the SpaceX website via Transterrestrial Musings.

Flight 4 of Falcon 1

As mentioned in my update last month, we do expect to conduct a launch countdown in late September — as scheduled.

Having said that, it is still possible that we encounter an issue that needs to be investigated, which would delay launch until the next available window in late October. If preparations go smoothly, we will conduct a static fire on Saturday and launch sometime between Tuesday and Thursday (California time).

The SpaceX team worked hard to make this launch window, but we also took the time to review data from Flight 3 in detail. In addition to us reviewing the data, we had several outside experts check the data and conclusions. No flight critical problems were found apart from the thrust transient issue.

Go!

Hope this one's a success. The second launch came so close before the fuel swirl issue grew beyond its control, and the third...when I saw that first stage bounce back up around the bell before second stage ignition, I wanted to bang my head against the wall.

Any idea why they didn't use accelerometers to determine when to separate?

Interesting note for any lurking or non lurking Apollo Hoax Conspiracy Theorists. Notice how the exhaust spreads out, and becomes nearly invisible, and the lack of sound near the end.

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It's great how they can diagnose the problem and get back to the pad in a few short months. Instead of months of hearings and billions of dollars.

But I’ll still bring the weenies to the next launch. Who will bring the marshmellos?

I just saw this on Transterrestrial Musings:

No Launch Tonight
Just got an email from Elon:

The static fire took place on Saturday [20 Sep 2008, CA time], as expected, and no major issues came up. However, after a detailed analysis of data, we decided to replace a component in the 2nd stage engine LOX supply line. There is a good chance we would be ok flying as is, but we are being extremely cautious.

This adds a few extra days to the schedule, so the updated launch window estimate is now Sept 28th through Oct 1st [CA time].

So if they hold to that schedule, the fourth Falcon 1 launch attempt could be early next week.

They are SO stubborn...

www.spacex.com/F1-004.php
spaceflightnow.com/falcon/004/080927preview.html

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Sanity is overrated.
Butterfly.

See previous thread on the flight. Glad to see they're going to try again tonight.

But they're stubborn in the good way!

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I want to go back to the moon.
I don't care which rocket you use, whichever one you pick, I'll like it, I swear.
"If you think the LHC will create black holes, you might as well believe Hobbits are at the bottom of your garden."- Dr. Mike Inglis
Rovers forever! - ToSeek

If you can't stand failures, don't start a space launch company. Sell rabbit cages instead, they have a lesser tendency to explode halfway through their mission.

That said, I hope this attempt is a success, because if you don't strive for successes, you shouldn't start a space launch company .

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To the regular visitor of internet bulletin boards it is clear that it's an excellent idea your parents get to choose your real name.

SpaceX Website
SpaceX: Falcon 1 Flight 4 Blog

Start of 5-hour launch window:
September 28, 1600 PDT, Sunday
September 28, 1900 EDT, Sunday
September 28, 2300 UTC, Sunday

Less that 4-1/2 hours to start of launch window

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Interestingly, they haven't had a single explosion, to my knowledge...one engine fire and first stage abort, one late second stage instability leading to an abort, and one rather unusual incident where the stages separated and then came back together just before the second stage ignited, causing loss of control. That last one may have ended in explosion, but I had the impression it just went into a tumble and shut off.

Not long to go...

Falcon 1 Flight 4 Webcast is getting underaway.

Elevator music, so far...

The live video displays:

Text:

That would be about now.

Video graphic says "Webcast to begin at 3:45 Pacific" -- about 15 minutes from now.

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Go Falcon 1!

__________________
I want to go back to the moon.
I don't care which rocket you use, whichever one you pick, I'll like it, I swear.
"If you think the LHC will create black holes, you might as well believe Hobbits are at the bottom of your garden."- Dr. Mike Inglis
Rovers forever! - ToSeek

According to the Falcon 1 Flight 4 Webcast:

T - 00:15:00

15 minutes to launch (depending on built-in holds)

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5 minutes to launch

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Liftoff

Falcon 1 away

(And BAUT painfully slow)

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2 minutes in

BAUT's OK, but that video player sucks up all my cycles. Piece of junk.

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Clean staging, 2nd stage is burning!

Fairing separation.

Separation.

2nd stage OK

(Video player on standard instead of high quality is nicer.)

4 minutes in

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7 minutes in

all nominal

about 3 minutes remaining in 2nd stage burn

nozzle glowing red as it should

copy-falcon1-2ndstage.jpg

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Loss of signal. Hope for the best.

9 minutes in

loss of signal

not a big concern

1 minute to shutdown

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Awesome so far..

SECO!

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"Ignorance more frequently begets confidence than does knowledge" -- Charles Darwin
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Meet the OOONG TOE.

Signal back, second stage shut down. Looks like it made it.

SECO

in orbit

history

10 minutes in

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Congrats SpaceX. Well done!

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"Ignorance more frequently begets confidence than does knowledge" -- Charles Darwin
"Your right to hold an opinion is not being contested. Your expectation that it be taken seriously is." -- Jason Thompson
Meet the OOONG TOE.

International Herald Tribune: Rocket successfully launched from South Pacific

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Yay! Congratulations spacex!

(and grrrrrrrrrrrrrrrr! I missed it by an hour!! Is there any video up yet?)

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You don't plan sincerity. You have to make it up on the spot. -Denny Crane

I never make predictions, and I never will. -some footballer

I opened up the webcast just after separation, just minutes too late to see the whole thing. After repeatedly searching the site for any sign of when and where it'd be, and finally finding it in this thread. And still no video. They could definitely manage their site a little better...but the important thing is: success! Congratulations to SpaceX, and good luck with the upcoming Falcon 9 launch.