Interesting concept but doomed...
I monitored my last network and reported attacks from infected networks to the ISPs concerned. My reasoning was that my network was on the hit list of their infected networks and as such I would be targeted as soon as a new fault hit the net possibly before an anti virus fix was available to me.
If they did not take action, I then notified them that I would hold the ISP itself legally responsible for all and any clean up costs involved should my network be infected by one of their addresses.
The US ISPs were all fairly good about it and contacted users etc, eventually some of the UK ISPs jumped on the bandwagen and sorted their users, who happened to be large companies glad that they had been informed of the problems!
The biggest problem I had was a US ISP who instead of contacting the end user, told the network owner who cut the end user off and issued the letter as described above, ie "you will need to have your computer certified by a computer professional before we allow you to reconnect".
Problem one was it was our US ISP followed by problem 2, which was that the numpty in the (our) Serviced Office network providing company was unable to differentiate between source IP address and Destination IP address and cut our office off instead and then refused to speak to us hiding behind the ISP's order to him. Somehow via a transatlantic call I managed to get to the main carrier network support team who do not even have a phone as they only do online support! Must have been the Brit accent. They then realised what had happened and came down very heavily on the "network manager" resolving our problem in minutes.
Without me or the likes of me geeing up the ISPs this has probably died a death again, but nice to see someone is taking it seriously again.
All very well berating people for having infected machines, but with poor performance expected of todays PCs, the last person to know they are infected is usually the victim, and don't forget this silly rootkit idea came from UNIX, before MS probably patented it!