Specifically, I\'m looking for a client-side, JavaScript and / or Flash based multiple file uploader. The closest thing I\'ve found is FancyUpload. Anyone have experience
I've used FancyUpload plenty of times and it's absolutely fantastic. The only problem (but this is true for most flash uploaders, I guess) is session handling - if you're using sessions you're going to have to pass along the session ID to the flash file and back again.
digitarald (the author) has a new version of FancyUpload in beta now that works with Flash 10 (something a lot of the other uploaders don't). According to him it should be very simple to upgrade from FancyUpload2 to the new version, once it's released.