I'm going to add Oauth autenthication to my rails web app. Since I don't want to reinvent the wheel, have you got some ruby gem to suggest to add this kind of feature?
TIA Paolo
I would say that this advice is now superseded. I'd suggest you use OmniAuth instead, possibly with Devise if you need normal auth as well.
There are 2 OmniAuth specific RailsCasts that walk you through exactly what's needed: OmniAuth Part 1 and OmniAuth Part 2