Opera Mini is probably one of the best mobile web browsers out there right now. I use it all the time to open websites that the native BlackBerry browser cannot open. It has always had a slick user interface with lots of customization options. It is also very quick when compared to the native browser.
Opera Mini has been updated to version 6.5. This is actually a major update as it add quite a few new things for BlackBerry users. One of the more signification updates include the addition of multitouch support for OS 6.0 and newer devices.