For an overview of the membership plan see IMSLP:Membership Q&A.
For more information on the reasons behind this change, see this announcement on the IMSLP Forums.
Please note that some newly-uploaded scores may only be available after a day or two to non-subscribers.
I've seen at Amazon (with samples) that there exist a further movement: Pastorale Ad Libitum. --Ralph Theo Misch 23:36, 5 January 2011 (UTC)