Square Enix's Scarygirl, formerly a PSP game, has just been confirmed for a Euro/UK release, and it's definitely happening on PC. It's an action platformer, and it's based on the graphic novel by Nathan Jurevicius. Coming out on Xbox Live Arcade on the 18th Jan worldwide, a PC version will follow "shortly after", whatever that might mean. You can see a trailer for it below.
Oddly enough there's already a Scarygirl platformer on the comic's main site - I'm not sure the two are related, but she seems to make much better use of her tentacle arm in the forthcoming game. But this one's playable now, and is free. If a bit choppy. Anyhoo, here's the trailer: