Browsing through blogs related to rails development I found this site with reference to rails, or so called cheat sheet. Go and bookmark site. It is very useful for novice like me ;-) There is also PDF version available.
And finally – URL:
blog.invisible.ch/files/rails-reference-1.1.html
There is now a printed book, Rails Pocket Reference, available worldwide. It’s an very useful book (but I’m biased).