I got a Firefox update today to 3.6.12 and my browser has been repeatedly crashing.
There is one odd thing about the blog's clicks section. It says that today users clicked 'these links' from my blog, yet three of the links listed aren't even on my blog (no one from those seemingly legitimate blogs linked on the clicks section has ever commented on my blog, nor am I linked to from their blogs). Not sure if that has anything to do with anything but thought I'd mention it.
There are 3 possibilities you may not have considered.
(1) If you have "possibly related links" activated here > Appearnce > Extras the links clicked could have been among those.
(2) If you use Zemanta the links clicked could have been among those.
(3) WordPress.com does run advertising on our blogs so the links clicked could have been among those.