Look and feel - Using flash only as a proxy, not as the user interface
I have been working on a JQuery Upload widget that is not like the
others in one very important way. It looks and feels like a regular
Upload control.
I use an html textbox and button to make it look "regular" that way if
other plugins re-style it will all match and you won't have this flash
upload that looks completely different. You may think this is
unimportant, but I know 2 dozen web designers that agree with me.
I was still using flash to do the upload, but the flash was a
singleton, so I could have many uploads on one form and the singleton
would handle the behavior of these uploads (one at a time or
simultaneously). I was making it to report individual status (for each
upload control) and total status for the form. Also, I was adding
callbacks for form submission.
Anyway, I think you should strongly consider an implementation like
this. It will support other plugins this way an allow for further
changes to a page (beyond the ability of a "static" swf).