I love TextMate, but "Find In Project" drives me nuts. It's always crashing my box. I e-mailed TextMate's creator asking if he could just remove the feature from the next release. The response I got was incredibly cool. Instead of giving me the virtual finger, he told me you can do it like this:
sudo open /Applications/TextMate.app/Contents/Resources/English.lproj/MainMenu.nib
This command opens TextMate's UI in Interface Builder, which allows you to remove it from the menu. Removing it from the menu clobbers the key-command shortcut too, so it effectively removes the feature from your install completely.
It works. I dig it.