Joseph Gordon-Levitt should host the season premiere of Saturday Night Live. There, I said it. Inception's the summer's buzziest movie so far, and Gordon-Levitt's been a total charmer on every talk show promoting it. He's funny (read his blog!), he's done it before with aplomb, and this summer doesn't have another pop rallying point. Team JGL!
I do think there's a legit chance that JGL will host, but I wouldn't be too surprised to see Steve Carell do it, either: He's had two movies this summer, and he's gearing up for his final season of The Office, which conveniently airs on NBC. Julianne Moore, fresh off The Kids Are All Right, is another possibility, or maybe Katy Perry, from whom summer jams flow.