This is probably only useful in very specific parts of the world.
Around here EDGE gives me 200 kbps. On 3G I tend to get around 2500 kbps.
So a page that takes 10 seconds to load on 3G would take over a minute on EDGE.
How long before that extra 30 minutes of battery life gets wiped out by standing around waiting for my phone to load? Where I live this is 1 step forward, 5 steps back.