Mozilla is in the early stages of development of a mobile web service codenamed Joey. You can register for free at
Login and download an app for the 5810, 7100t, 7290, 7520, 8100, 8700, 8800 and Pearl.
I don't have any of the compatible BBs, so haven't been able to give it a try. I thought I would pass along the info for those that do and maybe you guys can provide some feedback.
***EDIT***
To clarify, this is more of a service than a browser. It allows you to take snippets of web pages while browsing with your desktop Firefox browser (via an extension). For example, you select with your mouse certain content on a web page and then with the extension choose to "Joey" it to your account. The content is then stored on a server that can be accessed by the app on your BB or mobile phone. This can be a video, stock ticker, scoreboard, news section, etc. and is dynamically updated on the server so you always have the most current information. A more thorough explanation can be found here:
Mozilla xxx8220;Joeyxxx8221; Service Opens Up Mobile Web - CIO.com - Business Technology Leadership