This plugin saves you time when moving between your browser and Textmate. It adds clickable links to the Rails backtrace when an error occurs, and clickable “footnotes” to the bottom of each page (in development mode only). When clicked, these links open the correct file in Textmate and move your cursor to the precise line of interest.

In your plugins directory, install with:

svn export \\
svn://syncid.textdriven.com/svn/opensource/textmate_footnotes/trunk \\
textmate_footnotes

This plugin was also featured in the syncPEOPLE on Rails bundle for Textmate.