I use Vim and now I'm using SciTE too.
Easy to configure and well documented, code folding for free, auto closing of xml tags, uses spaces or tabs according to the actual file or to your preference, show whitespaces and indentation, autocompletion (but only from the actual file), you can generate a python api file for calltips, support for UTF-8, runs on Linux and Windows. And is very small and fast (you can even put it on a usb drive).
The only negative point is that the author is more active on the Win side, anyway the GTK version works fine.
Oh, and gnome 2.14 will come with a totally new gedit which will even spot a cool python plugin system.
I'm really looking forward to see how this will turn out.