I could use a project to work on, and I know something about OAuth - I've interacted with Twitter's OAuth implementation as a dev, and implemented the client-side bits of it from scratch with no library (which I did so that I knew how it worked; for anything other than local tools, I'd obviously use a library), so... I'm willing to help!

[edit: Which is to say, I implemented it without an OAuth-specific library. I used libraries for URI escaping, URI parsing, HMAC-SHA1 encoding and base64 encoding.]