Exploring new codebases, let alone hacking them, can be tricky in a dynamic language like Ruby. Sometimes the best way is to stick a debugger or IRB in the source, and reflect on the objects. Ruby gives us a lot, but leaves it to us to present this information in a useful way.

Looksee is a tool to illustrate the ancestry and method tables pertaining to an object, and gives you a quick way to jump to the source of any method, all from within IRB. Version 1.0 introduces a few significant changes to make things easier on the fingers, and adds support for MRI 1.9, JRuby, and Rubinius!

http://github.com/oggy/looksee