I am. I'm in SF (working out of my apartment in the Haight).

I'm building Quirk ( http://www.getaquirk.com/ ) and I've got a related side project, a QR/URL-shortener - http://qrk.co/

Quirk is Rails on Heroku. qrk.co is Sinatra on Heroku.

Cofounders could come in a few forms. I'm a developer, but somewhat new to web dev. So someone with a deep technical background for web development with prior startup experience would work. Alternatively, someone with a really strong UX/design vision and some skills to drive the frontend would be great, too. I've been learning the necessary skills as I go.

There's contact info in my profile.