It would be very much helpful in Video conferencing with our abroad clients & partner giving real life like discussion without any loss in voice/images.
Video conferencing with high quality video would also be helpful in medical field for performing operations (like 3 Idiots

).
It would also be helpful for HDTV streaming.
Also it would be helpful in faster movement of huge data (if not porn/games/movies

) for various organisation.
These kinds of things are along the lines of what we had in mind - though considering there will be IPTV (HD and SD) bandwidth is more-or-less moot: the system can handle that any which way.
However, voice/video conferencing should still work fine even on 10mbit/s or less.
it could help small businesses reach out to International clients....just like SVK said, video conferencing...and maybe to watch legally available HD videos...
AC
Ok. Anything else other than a glorified
TV?
Finally real time gaming on such high bandwidth networks which of course would normally have low latency to international servers as well.
Otherwise when i actually gave a though about this i don't really need such high speed connections to download movies or whatever. This speed would just improve my overall online experience while browsing & help downloading that really needed file in a very short time or even office
VPN flawlessly.
Having 1gbit/s is not necessarily going to magically give you ping times of 60ms to the USA or Europe. They should be far better than existing ISPs -