Interesting article on the subject of fixing TCP's congestion control algorithm:
A lot of reasonable things are presented here, at a very high level. The graphs are especially interesting too. From what I have read of SCTP, this very nice protocol also has the potential to suffer from this problem.
Interesting thought question: what do you suppose an ISP is going to do when a large number of its customers begin hammering on their network with RTP traffic?
On the other hand, here is something that is very funny and very unreasonable:
This was originally here: http://i7.tinypic.com/5z6vt4n.jpg