These are great, although the first one I clicked (sandbox) logged me out of my google account. Ah well :) Kudos to Tony!

console.google.com is intresting! wonder whats behind the login screen!

It has something to do with adwords, i read online somwhere about it.

You have entered an invalid username/password. Please try again, or contact console-supportgoogle.com for assistance.

So, purchase.google.com. That sounds expensive. And what's the meaning of virgin.google.com?

Also fun is:

http://www.google.com/sitemap.xml

I like virgin.google.com. Will they soon be offering free virgins like they offer free email, mapping, search, IM, et cetera? One can only hope!

Note that there's both virgin.google.com and sprint.google.com. Virgin Mobile uses Sprint's network. Insert speculation here.

http://labs1.google.com/

picasa.google.com

Hmm, http://labs2.google.com is also available. Wonder what those are?

I've seen these before, over a year ago i think, so doubt that'll change soon. Seems strange that they haven't done anything with them. Why would they just have two mirror sites of google labs?

Wow, this is something interesting. Thanks for the info

I found a few more!! local.google.com and fusion.google.com redirects to google.com.

How do you go about finding them?

Using the Netcraft technology, you can "Search Web by Domain" http://searchdns.netcraft.com/?restriction=site+ends+with&host=.google.com