Sony recently released a Dev diary(video above) talking about Everquest Next and how they approach mining and crafting. EQ Next will be free to play and will be strongly influenced by Minecraft.

Ragnarok Online is a popular MMO that came out in 2003 and later on in it's life became free to play. It recently came to Steam on PC to serve your dungeon crawling needs.

Symmetrain is an interesting new iPhone game where you tap to select the differences in the terrain as your train chugs along the tracks. It's a pretty interesting idea and seems to fill the "I want to kill a few minutes" game itch.