5ubliminal - 5:13 pm on Apr 5, 2008 (gmt 0) Maybe just a brain phart;)
If link profile is similar I have a silly theory about trusted IPs / hosts. Some are more/less trusted by Google hence crawling / indexing / sandboxing differs. There's also the topic question ... how much competition is it out there. No two sites are the same and discrepancies may appear just due to their topics.
Maybe just a brain phart;)