E: textmate for windows
e-texteditor.com
e-texteditor.com
I've been using Eclipse for java development and have been very happy with it.
BTW, if you have not checked out Eclipse lately, see:
http://download.eclipse.org/eclipse/downloads/drops/R-3.2-200606291905/new_noteworthy/eclipse-news-all.html
Textmate is a seemingly minimalist programmer's editor. When you get into it and start hacking you start to see how much is really there. Definitely not an IDE though.
I've tarballed the latest bundles from their repository and renamed all ":?*\\|" characters to DOS friendly characters, if you want to try out a bundle that isn't included with E. You can grab it from: http://www.bigheadlabs.com/~jason/Bundles.tar.gz
Note: I use TM to edit the RoR files.
(Of course, most things are more interesting than a Vi/Emacs/whatever holy war)
Check out intype too. Found it through Digg. Not as polished as E-Text Editor though.