In my opinion, They have 2 famous games(Caesar IV, and COTN) and 3 unknown games(in the case of SimCity Societies I think the name and marketing have been the real problems) so i think that we must advertise these games with videos on youtube and sharing these on various social network, forums,...
Simcity Societies: i think that it would be nice to create a video that shows some creations of the fans and the possibility to custom the game.
Hinterland: in Youtube there'arent any walkthrough, tutorial or others so we must create some videos that shows the gameplay and how u can play it.
Mosby's Confederacy: the same things of Hinterland

Both 3 games have also a low price so it's another reason to buy one of these.

So if u want to see in future others innovative TM Games, advertise one of TM games!