Found this on Wired News...
Sure, news aggregators are handy tools, making Web surfing a breeze. But the programs are greedy little buggers that swamp websites with unwanted traffic. Something has to change, and soon. By Ryan Singel.
[Via Wired News]
There's a corresponding essay in the latest Wired magazine about RSS too which I wrote about here. Dave Winer points out the same point I made which is propely written RSS Aggregators should not cause a large increase in network traffic.