I suggest to allow optional user registration

I suggest to allow users to optionally register to this site ( may be using Facebook connect, Google, Twitter etc). This will allow returning users to easily manage their documents and can upgrade their account to premium service, if there is any.....

This anonymous share is good. But seems confusing for the returning user because of following reasons:

1) User is given a URL where as the file is not yet uploaded. If for some reason the upload is stopped then it will be bit irritating for other users whom that user has shared the file with.....Similarly there is no mechanism like email confirmation for the successful upload other then wait on the screen.

2) If i upload a file from chrome then Firefox won't detect it and won't show it by default (from cookies i  guess).....

3) Once i click New share then i cannot return to previous uploads to add another file. A link should be displayed at the homepage so that i can add files to it later...

These are just few ..... Overall the service it cool and auto play option can make it viral...