Although this hasn't made it into Cappuccino proper (needs a bit more
abstraction), this is the code we use in 280 Slides:
You need to set the URL on it, and you can also add parameters to it,
and you submit with the submit method.
The file is sent with the param name "file", and there are a few
delegate methods (search the code for [_delegate ).
Feel free to ask questions about this on the list, or in IRC
-Ross