Dane @ Sonic.Net blogged about the Apple effect on his network, including a graph of the traffic spikes.
Connected Planet has an article that describes current network usage as seen through Sandvine's latest study.
Traffic is going up. Usage especially for video is increasing. People are bored and don't want to talk to other people, so they stare at the screen day and night watching bad TV and horrible movies. Metered plans be damned.