Simply Rails 2

That would be: Ruby on Rails Power!: The Comprehensive Guide by Aneesha Bakharia. Its currently rated 2/5 on Amazon. For my 2 cents, I'd second both of Peter's suggestions - Foundation Rails 2 and Simply Rails 2 - though I do tend to like the former a little more. The latter is better if you have absolutely no prior web dev or programming experience.

I suggest you read http://guides.rubyonrails.org/getting_started.html then I recommend sitepoint Patrick Lenz - Simply Rails, although it is outdated (rails 2.0.2) but it have a solid simply background on rails knowledge.