This is what worked for me today (June 15, 2008). I don't know if this is a must, but first, download the handheld software Ver. 18.104.22.168. It IS available on the Verizon website and is linked from RIM BlackBerry - PDA Software Downloads - Support & Services at BlackBerry.com
or search the site, as it may change. The file is 95 Mb and you may lose a few settings as the program does a back-up, update, and then restoration. Download go to MyCast your digital media with Orb 2.0 remote pc access software
and download, find uSirius and download. When you later visit your Orb account on the computer, add the Sirius stream station addresses that you copy from the uSirius program. Then, login to mycast.orb.com on your Phone. The .3gp stream setting works for me. Good sound and stream quality . I'm done!