Please go to http://authorsforjapan.wordpress.com/ to view items and bid.
Also Michelle Read and Carrie Ryan are auctioning their books (autographed of course) on eBay. According to the description, “100% of the proceeds go to either Save the Children or the American Red Cross, both of which are doing work in Japan to help disaster victims. (They also help other tsunami-affected regions)”
You can view their auction listings here.
FYI — Michelle and Carrie’s auction is open to U.S. residents only.