Got my phone bill last month and it's my highest bandwidth usage ever. 875MB primarily because I streamed 640x480 video using Qik on the E75. Just goes to show you that as I have suspected, once you start streaming at 640x480 or higher e.g. HD, your mobile bandwidth is going to start rapidly rising and suddenly having a multi-gigabyte data plan makes sense!
In other words once Apple catches up :-) with Nokia in terms of being able to stream 640x480 or higher resolution video over 3G, 3.5 G or 4G, it's going to bring the mobile network to its knees (at least the Canadian mobile networks and probably most other North American ones which are not designed for mass market video streaming)!