Hi all!
This is a very belated announcement of the Arduino TextMate Bundle I've had up for a while. I just got support for 1.0 in and I thought I would mention it on the forums at long last!
At the moment, it supports Arduino 1.0 and the UNO board, uploads code, highlights syntax, has some useful snippets and completions, includes a basic serial monitor, and has a handy local documentation shortcut. Crucial missing features are multiple files, libraries, and unexpected behavior if you write your own functions (it does not forward declare them, so the order they're written in matters).
For simple sketches, it's already very functional. The ultimate goal is to support anything you can do from the Arduino IDE in TextMate.
Check it out on GitHub. I'd love to get feedback from the community.
Happy hacking!