I am looking to teach someone the distance scales in astronomy. I'm sure I could put something together after about 15 minutes on wikipedia, but there has to be a slick web-site that is much cooler. The type of lesson I have in mind would include:

The size of the Earth (thousands of miles/light-milliseconds)
The distance to the Sun/size of the solar system (light minutes)
Distance to the nearest star (4 light years)
Distance to the galactic center/size of the milky way (100k ly IIRC)
Distance to nearest Galaxy
Distance to next Galaxy cluster
Furthest observed galaxy
...

Does anyone know of a web site like this?

hmmm
I think one end or the other of your scale is going to be too difficult to see.
http://www2.potsdam.edu/islamma/Phys335Ch01Cosmos.htm

-V

You are right, it is difficult to show the massive changes in length scale without resorting to something very mathy (like a log plot). I'm envisioning some sort of animation where the view progressively zooms out to show larger and larger structures, but someone out there has put more thought into this than I have.

NASA did one:
Cosmic Distance Scales

I've seen a better one recommended elsewhere in BAUT. Someone will probably provide it again, or I maybe I can recall enough to find it with a search.

(It's not the one I was recalling, but site Powers of Ten has many visualizations of powers of 10. Too much balky cumbersome Shockwave junk.)

I think the one I remember is Atlas of the Universe (but for lowest scale it starts at local stars).

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0 1 1 0 1 0 0 1 1 0 0 1 0 1 1 0 1 0 0 1 0 1 1 0 0 1 1 0 1 0 0 1 1 0 0 1 0 1 1 0 0 1 1 0 1 0 0 1 0 1 1 0 1 0 0 1 1 0 0 1 0 1 1 0 ...

That NASA page is close to what I was thinking of. The only problem is their use of km for the distance scale. Once a number gets big, all the zeros just blend together. People understand that 1000 is a lot bigger than 1, and a million is a lot bigger than a thousand. But, most non-scientists don't appreciate the difference between 10^18 and 10^21. Especially if they are written like 1,000,000,000,000,000,000,000 and 1,000,000,000,000,000,000.