BBEdit has one thing that TextMate misses, (S)FTP support. I don't want to copy files across to my machine to edit them, and then FTP them back. I want to just go grab it and make the edit remotely.
Once TM does that, I will gladly uninstall BBEdit. TM is fun to play with locally but, real work needs BBEdit.
Alternatively you could go for Cyberduck in combo with textmate. I don't like to have integrated (s)ftp tools anyways (They never seem to do the things I want in quite the way I want them to) so I'm quite content with TM not implementing them. Cyberduck is my preferred sftp-tool and hitting edit on any file will open it in TM with all saves going to the remote site, growl integration to let me know when it's done and I'm happily punching code over the wire
I still wish I could use it for free on my old desktop g4 though which is now acting as a server, I just don't get to edit so often there, I guess I'll have to be content with textwrangler or some other freebe.