I just started using TinyMCE inside django's admin interface on one
site I'm working on. Simon is right... it's a bit sloppy and, from my
experience, really falters when pasting text. I've even had pages not
saving correctly after pasting text from another application. As long
as I stick with editing inside TinyMCE, and not pasting anything inside
from external applications, things seem to work out pretty well.
It's a tough choice. Textile will produce cleaner code, but then you
introduce a steeper learning curve for new users to your system.