Today was one of those occasions that comes once, maybe twice (but definitely not thrice) in a lifetime. Gabe Newell arose from his Scrooge McDuck-esque lake of knives and cash to conduct an AMA. Spoiler: he likes Portal 2 more than Half-Life, and despite appearances to the contrary, Valve still makes games.
Source: Kotaku – The Most Interesting Answers From Gabe Newell’s AMA