For some perspective on how low 2GB is, this isn't just about video, it is audio streaming too...
Pandora uses 64 kbps for normal quality and 128 kbps for high quality.
64 kilobits (Kb) = 8 kilobytes (KB)
8 kilobytes = 0.008 megabytes (MB)
0.008 MB per second * 60 seconds = 0.48 MB per minute
0.48 MB per minute * 60 minutes = 28.8 MB per hour
28.8 MB per hour * 8 hours = 230.4 MB per work day
230.4 MB per day * 23 work days in a month (max) = 5,299.2 MB
5,299.2 MB = ~5.3 GB
Double that if you are listing to the high quality stream.
True, but if you're at work it can just go over WiFi (or just use Pandora on your computer). I think it's a bum deal because the terms changed just a month in, but as an iPad owner I'd have to try hard to use 2GB per month outside the range of WiFi.
Let's not forget about magazine apps either. There was a recent submission about Wired's app being 500MB for one issue. If all of the magazine apps end up being the same size, you could only get 4 mags per month and nothing else.