Introduction to Ruby

I'm about to embark on learning Ruby, so that I can implement a HTTP server that only implements the Atom API—nothing more. I've already found my HTTP framework (technically, Matt found it for me), which saves me the trouble of reading HTTP 1.1, writing the conformance suite for it, then writing the HTTP framework (this would have been done in PLT Scheme; I've switched to Ruby because of WEBrick). Now I need to:

1. Figure out unit testing in Ruby. Should be easy.
2. Learn the Atom API and Atom.
3. Find for or write the conformance suite for Atom API.
4. Write and release the program.

If anyone can point to good resources, let me know.

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