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Does it provide PeerBlock (http://www.peerblock.com/) style protection? Or can it be integrated into it?

Peerblock is effectively useless. There's no reason to waste time implementing it.

Why is it useless?

Because it is trivial for anyone who wants to sample a swarm to get a new IP address.

care to share why? I've been using it for a couple years now.

It doesn't, but it could