Personally, I'm going to be keeping my unlimited. I'm still using an iPhone 2g and my usage is generally around 300MB per month. I'm finally going to upgrade when the 4 comes out and with all the new features and the availability of 3g means I think I'm going to be using a lot more data. Especially since my workplace doesn't offer any kind of WiFi. If I end up regularly using less data, that's fine, but the extra $5 a month for unlimited vs. 2GB isn't going to break my budget.