I've been a TextMate user for a long time now and I'm still finding new things to do with it. Here recently I wanted to use the RubyAMP TextMate Bundle and was a little miffed to find that it was pointing to my OS X system ruby. The error message looked something like this when it went looking for my ruby/gems.

No such file to load -- appscript (LoadError) from 
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require’
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems/custom_require.rb:27:in `require’
...