Didn't know this about box.net and their app.
A while ago, one of the updates to the box.net app had some problems downloading so when they got it fixed they offered those that got it a free upgrade to the 50GB account. On the surface this looked great. Today I tried to load some movies to box.net and found that even though I have 50GB of space, I'm limited to uploading files of 100MB or less at one time.
50GB of space is great, but it will take a heck of a long time to use it up 100MB at a time.
Mike