I tried your app -- nice app. I like the idea.

A suggestion: One thing would be nice is the ability to have the url of the file copied into the clipboard once the file is uploaded. Like with TinyGrab, when you take a screenshot and it uploads the image. It would probably mean adding a new textfield (for the base url) in the form for adding a new bookmark. Might be useful for sharing files that you just uploaded.

Edit: i didn't think about when you upload multiple files, though. Maybe it would be the last file uploaded?