[eluser]Fabdrol[/eluser]
Hi!
I did. I wrote an Google Gears - based javascript library and a Class to handle the uploads.
Though, users need to select all the Files in the folder, they can't just select the folder and hope Gears will pick up all the files.
It's quite complex though, but if you're interested I can post the code. You could also take a look at SWFUpload or Uploadify. (last one doesn't quite work with CI)
Cheers,
Fabian