Hi all,
I just discovered zen-coding (http://code.google.com/p/zen-coding/), which I find quite impressive. You can view a screencast for a quick overview of it's capabilites on Vimeo: http://vimeo.com/7405114.
Full TextMate support has been added recently (you'll have to install Zen.Coding.tmbundle, Zen.CSS.tmbundle and Zen.HTML.tmbundle).
Sorry for the noise if you already have been aware of this, but IMHO this is just too good to miss it…
Cheers,
Andreas