If you had told me a year ago I would be generating test xml with Ruby scripts where it grabs random words out of some hidden unix dictionary (/usr/share/dict/words) and then randomly choses some numbers in order to test the limitations of my Flash components.

Then I would have said your joking, but thanks to Textmate here we are

Hell its even smart enough to tell if you dragged and dropped an image onto empty CSS, into a class, or into the quotes inside a background-image and then act accordingly.

Oh and the syntax highlighting, so beautifully mac like using transparency so you can see overlaying elements and when you select text you can see the highlighting through it. I can't edit text efficiently on Windows now (well that and the fact you dont have the granularity of cmd/option/ctrl + left/right) because you select something and you just get a massive block of colour and your brain has to think about the makeup of whats inside this block.