I have not tried it yet, and it is still very much a work in progress, but now Fuse and the ssh file system are available for OS X:
http://googlemac.blogspot.com/2007/01/taming-mac-os-x-file-systems.html
If that works well there would be no need for an ssh implementation in TextMate, and Allan could use the time to add other cool things... And it probably is just a matter of time before ftp will be supported by this as well.
Gerd