im a bit fuzzy on the difference between publisher and developer so bare with me...
favourite: Bethesda (elder scrolls iv oblivion, fallout 3)
VALVe (the orange box.... and left 4 dead looks quite good)
Konami (the metal gear solid series and time hollow which i never thought i'd like XD)
Ubisoft (assassins creed, the splinter cell series)
Lionhead.. which i think may be developer (the black and white and fable series)
least favourite: i dont really dislike any publisher... but Bungie kina annoy me because they have the potential to make good games, its just they just wont let go of the halo series