Years ago I tried using the ThunderHawk web browser on my Pocket PC to get a better browsing experience. ThunderHawk was developed by Bitstream and is a server-side browser like the new Skyfire browser that is under development. I just read over on CrackBerry.com that Bitstream is working on a new browser called Bolt for Java-enabled handsets. The Bolt browser is in beta right now and CrackBerry.com has 1,000 invites so get on over and sign up for the beta to test on your device.
While I no longer have a BlackBerry-enabled SIM, I plan to try out the Bolt browser on my Nokia E71 to see how it works. I am quite happy with Skyfire on my E71 since it lets me view Hulu.com videos right on my phone. The Bolt browser is capable of working on a much larger number of phones and looks to really be optimized for the majority of people with non-smartphone devices. The beta is currently free to try out.
UPDATE: As posted in the comments they are offering beta referral codes for the first 500 readers to sign up. Go to www.BoltBrowser.com, enter ZDNET in the referral field and you will be sent a link to download the latest build of BOLT. This code will be good for the first 500 readers that respond. I have my beta download and plan to test it out soon myself.