I found this blog entry, maybe its a starting point. If you follow on of the <id>
links you get another format where you should find the rtsp link.
EDIT:
after going through what WarrenFaith posted. PROPS TO HIM
this is how you get a rtsp link.
- make a request
- parse that data for the 3gp content
- It also provides you with the rating and all that good stuff that you may want.
hope that helps you guys