Please add Safari 5 to the browser sniffer. (It works fine if I change the User-Agent to "Chrome 6", so presumably it should be included in the list of browsers that you support.)
Safari 5, at least on Windows, doesn't support the File and FileReader APIs which are necessary for the drag and drop uploader. If you've seen otherwise, please let me know (I love the Safari team, and don't want to be unfair to them).
