Two new conferences related to Algorithmic Game Theory are taking place during this coming May:
- International conference for Game Theory for Networks (GameNets), taking place in Istanbul during 13-15 May. Among the plenary speakers is Robert Aumann.
- The First Conference on Auctions, Market Mechanisms and Their Applications (AMMA), taking place in Boston during 8-9 May.
Turing's Invisible Hand 
One more new related conference:
1st INTERNATIONAL CONFERENCE ON ALGORITHMIC DECISION THEORY
http://events.math.unipd.it/adt2009/