Next week I'm sure Rails will be completely pass in favor of Merb (managed by git, of course). But for now, here's the stuff that makes me a happy programmer this weekend:

• Rspec With Xpath.
• Autotest/Zentest
• Continuous Integration (a practice not an app.)
• CruiseControl.rb (see this for Rails).
• CSS Dryer. Here's my last ramble about server parsed CSS.