I was very happy to see the announcement of the Fingerprint Sharing Alliance this morning.
I have long contended that ISP's and carriers abrogated their duty when they took the stance: "We're common carriers. We don't care what is in the packets as long as we deliver them to their destination". That worked great until SQL Slammer hit and the dirty packets brought their networks down. Slammer forced ISP's to start filtering some ports.
Now a bunch of them are agreeing to share data from the netflow sensors they use to monitor traffic patterns. This will be a great tool in the battle against the extortionists that use the threat of a denial of service attack to sweat money out of e-commerce sites.