I've only got one prediction for 2008, and it's this: Spam is going to be even less tolerated by internet service providers than it is in 2007. ISPs are continually tightening up their sending guidelines and acceptable use policies, and things you might have gotten away with in 2006 or 2007 will no longer be kosher. Opt-out append? Purchased lists? Third-party lists? Mailing to t…