ATT 3G and iPhone 3G SIM Card

After reading a blog on the iPhone's 3G SIM Card, and after looking at ATT's plans for their 3G Network, I don't think it will be too long before we have broadband speeds on our iPhones. I guess it's delayed, but I would expect that ATT will be rolling out their 3G network sooner rather than later, and I wouldn't imagine that it will cost only an additional $20 per month. It would be awesome if it did, but I don't think it will.