Agreed, problem is the node is likely just an infected computer and won't slow him down at all. There is discussion going on how to prevent blocks like this
here.Long term though, with the block reward decreasing there will be more incentive to include transactions. I don't think it's really a big problem though, and even if it were, how do you stop botnets on the bitcoin network? And would people be so upset about it if they processed transactions like any other miner?
Edit:
I really dont understand what you guys are reading in to those IPs?
The IPS are of whoever is relaying the blocks, you could be looking at the IP of deepbit, or any other pool or random bitcoin user.
So your saying its what? A hacked linux box some place? My senile mothers zombie laptop?
we could still start an investigation that could point in the direction of the botnet
we could still get lucky
it certainly cant hurt

Like my Dad always told me, "You'll never get lucky if you don't try."
