The only thing missing for me to be able to use it in my day-to-day work is the possibility to have projects synchronize with an ftp-server. I'm a web developer, and most of the time I work against a remote ftp-server (not always, but quite often).
SFTP support is planned for version 1.1. And unlike most editors that merely integrate with Transmit or other existing programs, the plan is to have support from within TextMate.
There's no immediate plans to support the regular, unsecure version of FTP. But it all depends on what the community around TextMate is most interested in. -- David Heinemeier Hansson, http://www.rubyonrails.org/ -- Web-application framework for Ruby http://www.instiki.org/ -- A No-Step-Three Wiki in Ruby http://macromates.com/ -- TextMate: Code and markup editor for OS X http://www.basecamphq.com/ -- Web-based Project Management http://www.loudthinking.com/ -- Broadcasting Brain http://www.nextangle.com/ -- Development & Consulting Services