The trac-wiki.el package allows one to view and edit wiki pages in Trac directly from Emacs. I've gotten it working with GNU Emacs
Once you've installed xml-rpc.el and the patched trac-wiki.el in your load-path, you are ready. To use trac-wiki.el, load it, then do:M-x trac-wiki RET RET http://trac.sacrideo.us/wg RET y <username> RET <password> RET WikiStart RET
This will take you to the Trac wiki's home page. Use C-h m for details about more commands you can use to get info about pages, including diffs, and to edit them directly in Emacs.
I'm using Emacs 23.2 on OS X. I haven't tested this with other versions of Emacs.