I forgot to add - although TextMate doesn't currently support it, I have found it interesting, and in some cases not bad, the way that SciTE changes fonts from one type of element to another, with some (e.g. comments) even being *gasp* not monospaced.
I know, I thought I'd hate it, too. And sometimes it's a PITA, like if you have a huge RDoc block with code example inside of it that you're trying to line up. But sometimes it just feels like prose or something.