some very good idea's m8 but sadly I cant see any of them being implemented.
There is another solution - one that all the ISP's could bring into force in 5 minutes....
With very few exeptions most spam mails and spreading virus's will spoof the source address, Becouse of the way that 2k, xp pro and home work with regards to the sockets this is very easy to do.
If all ISP'S added a simple one line rule on there routers it would stop 90% of these incidents. The line simply will not forward packets that do not have a valid source address that are originating from there networks source. This is simple to do but none of the ISP'S are interested in doing this !!!
These problems are not going to go away until the companies that run and maintain the net pull there thumbs out of there butts !!!!!