I can stream XM radio through my 8330 with Orb and uXM program which is the same thing but just for XM listeners.
If the uSirius program is just like the uXM one I use, all you need to do is hit the URL button on the uSirius program and go to the drop down list and select the channel you want.
Once selected it will give you the IP address that you need to copy paste onto the Orb.com website.
On the website you will go to audio, internet radio, add custom, type w/e you wanna call it and paste the IP into the path area and hit ok.
You should be able to see the channel in your favorites and then connect to the orb website via your bberry and click on the channel, it should see if your phones fast enough for streaming then bring up the link to stream the radio station you picked.
Listen and enjoy.
This link should help if you cannot follow my directions. Stream XM and Sirius To Your iPhone and iPod Touch - With a Little Help