Probably this isn't news to anyone but me, but just in case: Last I heard Komodo was a very highly regarded IDE that unfortunately cost money. Yesterday I discovered that they now have an editor available for free.
Doesn't contain all the features of the IDE, but just having glanced at it it seems to contain more than I'll ever use. What I really like about it is that one can write Komodo scripts in Python (using an extensive API allowing various manipulations of the current document). -- http://mail.python.org/mailman/listinfo/python-list