The pixmap theme engine is reportedly really hacky, so nobody wants to touch it. That's also why the newest KDE runs GTK Pixmap-based themes faster than GTK can.
In conclusion: GTK is nice, as long as you don't want to anything slightly nonstandard. :)
Please note that if you're not using a pixmap-based theme, this message doesn't apply to you.
Current CVS LoserJabber is once again a release candidate.
The color preview now applies to your username, as Brad requested.