Your comments

Espresso does this really well, and is critical when dealing with lots of files of the same name:

I would love to see not just the project name, but rather the top-level 'Folder' name ala Textmate.  eg:

index.php - mysite_dev

If you have multiple files with the same name, it is currently impossible to tell them apart without hovering on the filename in the 'Files' list