Using The New Essential Guide to Alien Species (Del Ray, 2006), and some hard work with a calculator and yellow legal pad, here are the Drake variables as applied to the Star Wars Galaxy:
Number of stars: 400 billion
Number of stars with planets: not given, but I estimated 300 billion
Number of planets suitable for life: 200 billion
Number of planets where life arises: 20 billion
Number of worlds where intelligent life arises: 20 million
Number of worlds whose communications can be detected: The Holo-net seems to work everywhere, so I'd say all of them.
Broadcast time: For isolated civilizations, about 10,000 years. For Republic worlds, potentially forever.

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Rovers forever! - ToSeek
"The only way to explore the universe is to go and look." - Brian Cox
Well, the best way to find out is to go there and, find out. - Raven's Cry
'Evolution and science are one thing, but you don’t mess with Yoko Ono. Everybody knows that. ' - 386sx

Yeah, but they got the Force out there binding molecules into lifeforms and whatnot. So they have an unfair advantage.

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"If this were play'd upon a stage now, I could condemn it as an improbable fiction."
Shakespeare, Twelfth Night
Illuminati's Razor-The most complicatedly evil answer is usually the most correct answer. - Fazor
"Every book is a children's book if the kid can read." - Mitch Hedberg
"Distance doesn’t matter much in space, where if you just start a thing off with the right kind of shove, sooner or later it will get where you want it to go." -Frederik Pohl, Mining the Oort

Might need to whack a few new varibles into the Drake equation. Number of advanced civilizations created by protocol droids pretending to be gods. Number of civilizations destroyed to demonstrate the operational capabilities of death stars, etc.

Only two worlds were ever destroyed by the Death Star. Alderaan, and the prison colony where it was built.
But you're right, Imperial Superweapons do muddy the waters a bit.

__________________
Rovers forever! - ToSeek
"The only way to explore the universe is to go and look." - Brian Cox
Well, the best way to find out is to go there and, find out. - Raven's Cry
'Evolution and science are one thing, but you don’t mess with Yoko Ono. Everybody knows that. ' - 386sx

But in a universe where people think it's fun to bullseye womprats in their T-16, two planets is surely just the beginning.

I'll compile a list of all planets destroyed by superweapons and add it to the list, but I can't at the moment, as my brother is itching to use the computer.

__________________
Rovers forever! - ToSeek
"The only way to explore the universe is to go and look." - Brian Cox
Well, the best way to find out is to go there and, find out. - Raven's Cry
'Evolution and science are one thing, but you don’t mess with Yoko Ono. Everybody knows that. ' - 386sx

Plus their galaxy is fully explored and its inhabitants known; they have millions of data points to work with. We have to go on guesswork.

__________________
"If this were play'd upon a stage now, I could condemn it as an improbable fiction."
Shakespeare, Twelfth Night
Illuminati's Razor-The most complicatedly evil answer is usually the most correct answer. - Fazor
"Every book is a children's book if the kid can read." - Mitch Hedberg
"Distance doesn’t matter much in space, where if you just start a thing off with the right kind of shove, sooner or later it will get where you want it to go." -Frederik Pohl, Mining the Oort

Not fully explored, hence the whole area called The Unknown Regions.
Oh, and some smart Wookieepedian already made the list I was going to make.
This calculation was just something I did for fun, it doesn't have a point. Although I guess you could use it to teach people about the Drake Equation.

__________________
Rovers forever! - ToSeek
"The only way to explore the universe is to go and look." - Brian Cox
Well, the best way to find out is to go there and, find out. - Raven's Cry
'Evolution and science are one thing, but you don’t mess with Yoko Ono. Everybody knows that. ' - 386sx

You do realize that the Star Wars Galaxy is billions of years old and probably there have been millions of galactic empires and millions of superweapons.

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Fields of Space

LOGIC, n.
The art of thinking and reasoning in strict accordance with the limitations and incapacities of the human misunderstanding.

In the Year 2525.

"One small step for (a) man. One giant leap for mankind".

If an astronaut doesn't need good grammar, niether does you.

Host of Seraphim

Always glad to meet a fellow fan.

__________________
Rovers forever! - ToSeek
"The only way to explore the universe is to go and look." - Brian Cox
Well, the best way to find out is to go there and, find out. - Raven's Cry
'Evolution and science are one thing, but you don’t mess with Yoko Ono. Everybody knows that. ' - 386sx