A very useful feature of Safari, successfully copied by Camino, is that upon completion of a file download, the Downloads folder stack in the Dock will bounce. To me, this is far superior to switching back and forth to the Downloads window to determine when my download is complete. Apparently implementing the bounce is one line of code[1]. This is one of the last places where Safari gives me a superior workflow and it seems so easy to fix. Growl notification would be just as good, but that's probably more a great deal more code and relies on a third-party framework.
Thanks,
Nick
[1]
http://13bold.com/quick-tricks/bounc...wnloads-stack/