[carbon8]

Here's my big list from a few months ago:

http://news.ycombinator.com/item?id=1088737

Also, although I've only skimmed mhartl's book, it looks great and has already been updated for Rails 3: http://railstutorial.org/book

And for the edge rails guides (Rails 3): http://edgeguides.rubyonrails.org/