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Netflix's 720p streams use 2.3GB/hour, which would certainly put you over 5GB. I'm not sure about their lower quality streams though.

Hmmm, maybe that is it then. I'd be surprised if I was getting that data rate on my 3G connection (iphone 4s, at&t).

I'm still shocked it happened so quickly though. I guess 5 GB isn't what it used to be! ;)