Amazon has just confirmed that the new Kindle Touch 3G can only access normal web pages over WiFi. The built in unlimited 3G is only for downloading books and accessing Wikipedia from anywhere. If a user with a Kindle Touch 3G wants to browse anything either than Wikipedia or Download books they will have to connect to Wifi.
It would be quite costly for Amazon to offer unlimited browsing over 3G so it makes a lot of sense that it would be limited to downloading books and Wikipedia. Although I believe they should offer a plan that users can buy to enable general internet browsing over 3G, right now they do not. Click here to see where 3G coverage is available for the Kindle Touch 3G.