Sites with the highest number of inbound links

Interesting statistics from SEOProfiler.com: ranking of sites by the number of incoming links. If filtered by the number of unique domains, the first ten looks like this.

1. maps.google.com - 82,299,570 unique domains
2. twitter.com - 43,738,644
3. en.wikipedia.org - 32,835,350
4. google.com - 28,619,414
5. wordpress.org - 28,346,552
6. validator.w3.org - 25,701,132
7. digg.com - 24,896,193
8. flickr.com - 24,114,941
9. facebook.com - 24,006,486
10. nytimes.com - 23,996,398

It is interesting, for example, that Amazon and NYTimes are higher than Youtube, and jigsaw.w3.org is higher than Microsoft and Picasa. The Yahoo site is inappropriate 34th place, and the departed Geocites.com is in 42nd.