I just found out about
Google's top 1000 websites list from a post on the fseek.me blog.
I expected to find mozilla.com near the top (it's position #10), but when, on a whim, I did a text search for getfirefox, I bumped into getpersonas.com at position #137, that's just plain cool. :)
Update: Here are the ones spotted so far:
10. mozilla.com
74. mozilla.org
137. getpersonas.com
673. mozilla-europe.org