Mainly by cooincidence with my personal GCII learning curve, during the beta I've begun trying to be more active in using econ and tech strength to build my diplo rating with the AIs. I was happy to read early on that the AIs would want a break between major agreements (trades), but I wonder if it might be reasonable (code-plausible) to exclude tribute offers from this "I'm ignoring you" stuff.
Anyone else think an AI should always be open to offers of "free" stuff?