Atlus- Odin Sphere, the SMT games, Catherine, the Persona series, ect. But this is what really made them earn my respect (which they sort of lost after the P4A region lock incident): Persona 4 the Golden. Its crammed full of new content, two new social links that don't feel crammed in but add deeper influence on the story, fan service for the music, and they even added a joke from a famous Persona 4 internet comic (Hiimdaisy). If thats not they're way of saying we love the fans, I don't know what is.
From Soft- 3D Dot Game Heroes, and Dark Souls and Demons Souls, both original challenging games that get their charm from their nostalgic difficulty/learning curve, and fun as hell pvp system. So fair warning From: If you add an easy mode, the souls series and its charm is DEAD. Just sayin.
Rocksteady- Batman.
Platinum Games/former Clover Studios- For never making an action game that disappoints, and for ending up doing the impossible: Making a better Devil May Cry game (MGR Revengeance) then the actual new DmC.
Grasshopper Manufacturer- They're pretty much Platinum, but with crazier more original ideas and are led by the gaming industries version of Quentin Tarantino.
Kojima Productions- Cause Kojima is a nice guy who makes nice game, and I'll gladly pay $60 first day for a nice game made by a nice guy.
Rockstar- The funny thing about Rockstar is, as far as I know, they've never done anything infamous in the eyes of gamers. So the amount of trust and respect they've earned over the years can make anyone jump off a cliff with them... also they're games are pretty good.
And Valve- to find out why, read the rest of this thread. Because obvious.