I just released version 1.2 of my Textmate Trac bundle. It includes an awesome new Preview command contributed by Tudor Marghidanu. While editing a Trac wiki page, just hit command-option-control-p (same as Markdown, etc.) to pop up an HTML formatted preview of the page. Seriously useful. Thanks Tudor!
The command requires the Text::Trac perl module, which you can install from CPAN by running the following in Terminal:
sudo perl -MCPAN -e 'install Text::Trac'If this is the first time you’ve used CPAN, it will probably ask you a few questions, and accepting the defaults usually works out well.
Enjoy.