unless I am mistaken, .tar.gz attachments are not allowed while .zip attachments are. Even discounting the fact that this loses ownerhship and modes, I found this ... anticlimatic. Since we're at it, you might want to get rid of .bmp instead, and possibly .gif as well, just to make a statement. Ok, ok, just kidding.
I want to say that in spite of the nitpick above, the site is great and you're doing a good job.