I just noticed that the credit has to be spent by 31 August 2007. Any unspent credit will be canceled.
Quote:
YOUR CREDIT MUST BE SPENT ON OR BEFORE AUGUST 31, 2007; ANY UNUSED CREDIT AMOUNT REMAINING AS OF AUGUST 31, 2007 AT 12:00:00 A.M. PST WILL EXPIRE AT THAT TIME.
http://ebooks.connect.com/promos/terms_149/index.html