Ruby: Facets

The first time I stumbled upon Facets was on Mauricio Fernandez's hiki. I (stupidly) mentally bookmarked it, but never bothered to make it back.

Fortunately, I recently got an IM from Pat Farley letting me know that I was missing out.

Ruby Facets is the single largest collection of core extension methods and standard library additions available for the Ruby programming language. --facets.rubyforge.org

If you haven't looked at Facets, you are missing out. I suggest getting familiar with it by browsing the API one class at a time.