In BBEdit, TeXShop, Xcode, and I expect several other editors, one can double-click one half of a pair of delimiters (e.g., braces, brackets, or parentheses), the editor will find its other half, and then it will select the delimiters and all the text in between. I noticed you can't do this in TextMate. Looking through the help, I noticed that you can do this by placing the cursor in the right place and typing cmd-shft-b, but it is much easier to double-click to get the same result. This has also been requested in the wiki, but I couldn't find a response -- is something like this planned? If not, consider this another request for this feature. :-)
Thank you,
-- Gary