PC recommendations
check out Penumbra made by the same people as Amnesia
Mount & blade: warband is a great RPG/strategy/medieval combat sim
I recommend trying at least one spider web software game, they offer large demos
the current steam sale has a great inde game demo for $5US for the next 7 hours includes some great platformers, adventure and puzzle games
also if you like some competitive/co-op multiplayer try some League of Legends
and if your PC can handle it grab Starcraft 2
if you don't mind bugs and like shooters with RPG elements (conversations, quests, inventory and equipment management) the S.T.A.L.K.E.R. series would be a good place to look.
DS
if you don't have them get Castlevania: Order of Ecclesia, the world ends with you, Fire Emblem, Chrono Trigger, Dragon quest IX and GTA china town wars
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