To ragger
I think you're right. From a single host you cannot do a lot of harm. The best you can do is adding the gnutella attack to your own (Gnutella's response will be delayed)

Still, it is a very simple and obvious scheme. And there is no real use for directing a queue request to a different IP.

Adding those two with a script kiddie and a grummy site operator, you get bad press about gnutella/p2p. (Like: grummy.com attacked by exploit in Gnutella)

Aan Cultiv8ter:
How's the weather in Philly?