As others have mentioned, there are plenty of good Ruby tutorials around. Personally, I thought "why's (poignant) Guide to Ruby"[1] was pretty great. It goes off topic quite a lot, but I think it's a joy to read while still learning the core concepts.
yeah. This is the best textbook I've ever read, period. The tangents are actually quite helpful, because they keep you motivated to keep reading, and slow down the pace a bit. Also check out tryruby.org for an awesome interactive tutorial, which was originally written by the poignant author. Good luck, and chunky bacon (you'll get it when you read the book, which you absolutely should do)!
[1] http://mislav.uniqpath.com/poignant-guide/