Got this email today from EntreCard:
We have noticed that the total number of Entrecard credits in the system has grown rapidly. This has been due to the fact that more credits are being created than credits are leaving the system. If this inflation continues, Entrecard credits will be worth less and less. To ensure a stable credit economy and reduce the outstanding credits, Entrecard will no longer give Entrecard credits to the person receiving a drop. In other words, instead of awarding 2 credits for each drop (one to the dropper and one to the blog site owner), only 1 credit will be given to the dropper. This change will be effective September 1, 2009 and will last until further notice.I didn't spend much time dropping back when I was using EC, so this further confirms my decision to leave.
It seems EC just can't get rid of the credit inflation problem.