There appears to be no common trend to the compromised sites.
Some of them are running content management software; some of them aren't.
And it’s the chance that they will and that you will too.
It’s the chance to spend time together — maybe a lifetime but maybe just an hour.
Both of the first two I looked at--because I can't stay away from the "this site may harm your computer" tag--had a couple of interesting things in common: they were hosted on i Power Web, the notoriously insecure Web host I've written about on several occasions in the past; both had malicious redirection files in a directory named /backup/, both used a complex series of traffic redirectors before ending up at the malware site proper, and both were heavily seeded throughout Google using a very large number of popular pornographic and non-pornographic keywords.