Note that this is a living document and I'll update it if problems are uncovered. I'm also going to keep putting out geomorphs for the foreseeable future, though perhaps not with the same frequency as my peak period.
Thanks to everybody that commented on these tiles and expressed enthusiasm for the project. It really kept me going and I'm psyched that other folks are making awesome tiles of their own. And once again, thanks to Dyson for getting the ball moving.