File navigation application that works with TextMate, MacVim, and Carbon Emacs

It looks pretty, but I'm having a hard time figuring out when this would be handy. How often do you need to work with a file but you have no idea where it is?

If it included in-text search, that would add a lot. But even then I'm not convinced that I want a whole separate application just for searching and opening files. I always already have Vim and a terminal window open. I can search (using find, grep, ack, etc.) from the terminal window and then open via Vim. Having said that, I just don't find that I often need to search that way. I know where the files are: I put them there.