If you're considering an alternative to the Opera Browser bundled with the Nokia 6600, why not give Access Netfront for Series 60 a try?
It works on all Series 60 mobile phones, including Nokia 7650, 3650, 3660, 3620, 3600, 6600, 7610, Nokia N-Gage game deck, N-Gage QD game deck, Siemens SX-1, Sendo X, Nokia 6620, Nokia 6630, Nokia 6260, Panasonic X700, and Samsung SGH-D710. "Up until now, I've been using the Opera browser that came bundled with my Nokia 6600, and it has done an adequate job.
In fact I didn't think much more could be done with a browser on such a small screen and so little CPU power that the 6600 has. So I was pleasantly surprised by the performance of NetFront, and am still using it after a couple of weeks, despite its propensity to crash my phone every once in a while. Yes, NetFront does not seem to be the most stable app in the world. It has crashed badly several times, bringing the entire phone to a halt and causing spontaneous reboots.
With these issues, you'd think NetFront would be a lost cause. Not so. The Smart-Fit rendering option is such a huge advance over Opera's basic "all-or-nothing" rendering, that I'm sticking with NetFront and choosing to live with the crashes until they fix the issue.