Something I just thought of: maybe a quick workaround would be to cause opening a .tm_proj in TextMate to take the file browser to the Project Directory (or the first one at least). Since a lot of my projects ARE just one directory, that would definitely alleviate my current problem of all my project data being contained in a lot of proprietary tm_proj files that only work with one program. ;)

Maybe a good way for someone to test out the open file event handlers? Seems doable within the current system depending on the scriptability of the file browser.