C4 and ITV now have just such services but again the small window to watch things on.
Okay so there is the download option for BBCI and watch it full screen,but this can be quite daunting for many computer users.
All these catch up systems are fundamentally a great idea but are utterly flawed.A downloaded programme from BBCI will expire after a week and there is encryption in place to stop you copying it to a dvd to watch on your television.
Now the other side of BBCi is accessing it on virgin and via freesat but the vast majority of us don't have this service.
A solution would be to allow sending of the programme to a TV input say via usb but that may be in the pipeline,meanwhile get used to a small picture and terrible sound.