Great idea, great browser and great layout.
Only criticism I have are the back and forward buttons, Could you possibly make them arrows? White arrows would look nice with the blue behind them. The arrows would be the same therefore decreasing the size of the Forward button making them equal.
Also an options button and a refresh button would be great. You could have options such as themes, text size, view source, print, help, about and a few other options.
I don't like the blank white bar at the top which has File in it. Possibly an option to hide it?
Also when we get a notification, you could possibly put some Javascript in there and make it pop up at the bottom right hand corner in a blue box telling us we have a notification. Not like an actual pop up but in screen, even if we're searching through other websites it would still come up.
But this is a fantastic contribution and I hope this takes off. You should suggest this should be the actual NGU official browser.
Also, you could develop a blackberry app and an iPod/iPad/iPhone app so it's easier to cruise.