How to save data on iPhone 4S?

I have a 5 gigabyte plan for my iPhone 4S by AT&T and I use the Internet ALOT. It's already been 10 days and I have used 3 gigabytes worth of data. I DON'T have Wi-Fi in my house or around me either. So how can I save data without going over the 5 gigs? Please put as much as you can.

Streaming video takes a lot of data. Cut back here!
Try using another browser (other than safari) to partially load the page (without pictures). (Try Opera)

Obviously you need to cut back on all video.

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