According to the tool on the site:

Google: $4552,092,873

Myspace: $302,159,931

facebook: $221,692,985

ycombinator: $88,266

My own site (which admittedly is just a static page) is valued at $58. Got some work to do there...

I put in a site that has been making $1200+/month for the last two years and it tells me that the site can make $20/month. Fail.

Just out of curiosity, can you disclose which site is that?

Bogus.

For a recursive twist I typed in cwire.org.

""" Your site is valued at: $4,906

Your site could sell text link advertisements at a rate of approximately $0/Link/Month.

If you sell eight links, you could earn approximately $0/Month selling text links on your site.

Your site could earn approximately $135/Month through affiliate marketing".

Your site could earn approximately $0/Month through independent advertising arrangements specific to your site's niche. """

This tool is definitely crude (a newly created site is worth at least $50) but gives a good perspective on the factors one might use to interpret a site's value.

Paulgraham.com - $29,889

I certainly think that the information there is a bit more valuable, though I'm also pretty sure that it doesn't make the $829/month that it could.

My user page on reddit is worth $66. There's a lot of people who hate me and click on my profile to down-vote past comments. Attention advertisers!

sweet $359, any buyers? Now it's time to start filling out my executive summary.

recursive twist: cwire.org valued at $4,906 - which "could earn approximately $135/Month through affiliate marketing"!

Google = 580,000,000. Fail.

"Your site could sell text link advertisements at a rate of approximately $1,087,500/Link/Month.

If you sell eight links, you could earn approximately $8/Month selling text links on your site."

Right...