I see I'm not the only who thinks that this particular cleaning option is not entirely working as it should. Regular forms perhaps, but I often see a username and password that have been remembered by IE7, even though I'm positive I've used CCleaner since. And no, I'm not talking about cookies I'm keeping.
Edit: Yep, definitely still happening, the log-in info for these boards for example, was still there after a full CClean and reboot. And the forum cookie is not and never has been (just signed up...) in the to keep column...