Let's say you own a PS3 and rent the HD movies from their store. The are on average around 7 gigs a movie if you get HD. If you rent a movie every day that is 210 GBs right there.(Not that anyone would but if you do it once a week than that is still around 28 gigs.)
In my case I also stream netflix movies and do a lot of Youtube stuff and Gametrailers downloading updates like SP1 for Vista as well as regular updates for Windows as well as Mac updates and Ubuntu updates. Also Voip uses bandwidth. Tat there is MMO and we are on the eve of digital distribution.
A heavy user could top that 250 GB pretty fast at the speeds you could get. 250 Gigs may sound like a lot but I am looking forward to the day I can download 1080P movies that are roughly 15GB to own or even games or Online games that use more bandwidth foir a more immersive experience I see that as a handicap to progress.







