Im not advertising here or anything so dont get the wrong idea..I was really tired and annoyed at how slow the transfer times of big files to the MS duo from the psp were, some taking over 15 minutes. So I started looking for alternative copy programs that would be faster and more accurate(microsofts progress bar is far off, for me anyways). I eventually found one called Copy Handler. It works like a charm and transfers something like 30-50% faster and has wayyyy more features. You can download it at http://copyhandler.com/, Trust me its way faster.
Man that sounds like an ad or something lol