I've searched the forums via google for some bits of info, and a couple of times I've been redirected to some random auto sales site. Is this site doing the redirecting, or has g00gle finally gone to crap? Edit- Doh, looks like a spammy virus is redirecting some search result links.
I was just going to mention that it could be something infecting your computer, good luck getting it out of your system or get a Mac.
Yeah, windows is a pain, but I have to use it for work. I've run next to no security before and never had issues like this, so I imagine it's from visiting unfamiliar sites. I'll just wipe it and use dd to drop the newest partition image I have back onto the disk.