Google's Hosting What? Fun With Reverse IP Lookup

Interesting spot via Threadwatch, Reverse IP Tool and Google Servers lists a variety of weird and wacky domain names that come up when checking on IP addresses that are also used by Google servers. Google apparently doesn't own or operate all these domains. If I understand things right, some of the domain owners may simply be pointing their domains at Google. I'm sure someone will poke harder at this, and I'll postscript accordingly.