Ruby and Gem tip
Idling away in the #rubyonrails IRC channel sometimes makes you privy to tricks and tips concerning Ruby and Rails that you didn't already know. One such tip is the Ruby Gems documentation WEBrick incantation:
gem_server
which will magically invoke a local WEBrick server on port 8808. This instance lists all of your locally installed Ruby Gems and allow you to quickly and efficiently browse the rdoc contents for them. Very helpful indeed.