I am (we are) the guys that made/published Magicka - indie PC game that has sold over 1.4 Million copies - AMA.
We are Johan Pilestedt (game designer from Arrowhead Game Studios) and Shams Jorjani (producer at Paradox Interactive). Together we made and released Magicka in early 2011 and it became a runaway hit. We've released new content for the game regularly and are just about to release a Reddit robe for free and thought it would be a great opportunity to do an AMA. Ask us anything about the game, game development, the games industry or anything else that catches your fancy.
Edit: Johan will use his account: Pilestedt to respond
Edit 3: We're livestreaming! http://www.twitch.tv/paradoxinteractive