This was announced a couple of weeks ago on the Rails mailing list, but I thought it might be interesting to others in the textmate area whether for Rails development or for learning purposes.
The textmate_backtracer plugin (download here) for Ruby on Rails lets you easily jump from your web browser to textmate when a backtrace is given. Using the txmt:// protocol, the plugin intercepts the backtrace and inserts the file name and line numbers in a way textmate understands so that you can get to the source of the problem (no pun intended) in a single click.
Information available on my blog: http://inquirylabs.com/blog2005/?p=36
Direct download: http://inquirylabs.com/downloads/textmate_backtracer.tgz
Duane Johnson (canadaduane) http://blog.inquirylabs.com/