You can quickly open directories in the textmate project view from the terminal by typing “mate” followed by the path to the directory. So if you’ve already changed your directory to the one you want to work in you can just type “mate .”

(thanks rikrikrik for the tip)
In your files create comments (or class names, ...) including the strings “fixme”, “todo” or “changed”. You can then have TextMate search for all these strings at once in your entire project by pressing Control-Shift-T. The results are displayed in a nice little window linking to those files so you can easily go back and fix stuff:

I’ve held my presentation at barcamp london 6 this morning. It’s about developing frontend stuff with textmate. Mainly it’s loads of keyboard shortcuts which you’ve had the pleasure to see me demonstrate if you’ve have been there.
Have a look and try it out. Textmate is your friend.