According to TechCrunch, YouTube uploads from mobile devices are up 400% since the launch of the iPhone 3GS:
Even without the iPhone, YouTube is seeing major growth across the entire mobile space — the site has seen uploads go up 1700% over the last six months. It’s not hard to guess why. Video-enabled smartphones are becoming increasingly popular, as are high speed data connections. YouTube also attributes part of the growth to a streamlined upload flow (note how easy it is to upload a video from your iPhone to the site), as well as its improved sharing capabilities (you can now syndicate your videos to services like Facebook and Twitter).
I wonder how AT&T’s network engineers are handling this kind of influx of data transport.