This was reported in the tech support forums here:

http://www.sublimetext.com/forum/viewtopic.php?f=3&t=5744

It's an 80% solution (possibly) for this issue:

http://sublimetext.userecho.com/topic/89116-multiple-open-windows-to-the-same-file-use-the-same-edit-window-instance/

And it's what TextMate does.