Joshua Gans is auctioning off the first copy of his book Parentonomics on Ebay. Proceeds will go the MS Society so bidding gets you a good (autographed) read and does good. Joshua will match the bid with a contribution of his own.
Update (1): I bid $50 but was soon outbid. Go for it sons and daughters of the idle rich!
Update (2): By Sunday at 6-15pm it was $421. I'll buy it (eventually) but too rich for me at this price!