Really neat plugin.  Replaces the existing “find in project“ function and lets you use “git-grep“ if you like.  Best part is you can continue working while a hairy search is progressing.  However, you might not get a chance; this is a lot faster than the built-in project search:

In the beginning you had to stare at the beachball while TextMate searched synchronously through your project. Crashes occurred whenever it encountered a large file or was bored. Then came the grep bundles. They were good, but unfortunately they suffered the limitations of the TextMate bundle system. nice_find is a TextMate plugin that is written in Objective C and interacts directly with TextMate. It uses grep (or git-grep where available). As a result it is faster, more intuitive, and has a native look and feel that is the envy of all the bundles.