It is also worth mentioning too that virus writers are creating programs at the request of spammers that collect, AND transmit the contents of address books. Although this does not solve Stuarts annoying problem, it is another crafty way in which spammers are yet again one step of the technology to beat it.
Mark B's post though is right, we've been here before, ntl are not passing on email addresses to spammers, otherwise all my accounts with ntl would get spammed, and they don't, honest guv
The good news Mark B is that in the second phase the control of how spam is dealt with will be down to the user to a large extent where the email has not been blocked because the source IP is on an RBL, I'm sure somebody will confirm that for me.