They keep a sticky post in their announcements forum with the current list. The post as of today is https://forums.aws.amazon.com/ann.jspa?annID=1199, and the forum link (in case that didn't work) is https://forums.aws.amazon.com/forum.jspa?forumID=30.

(You probably have to have showdead on to see me because I'm hellbanned. I've emailled pg to try and get this fixed, and had no response. If you happen to see this, please check my comment history to realise that I'm not at all a troll, and consider upvoting me on the offchance it will get my account back into positive karma land. Thanks!)