I think breaking apart the Gaborik-Richards-Nash line was a good idea. They weren't meshing particularly well, and Nash and Hagelin are both getting a lot of points from each other. The third line of Callahan-Kreider-Miller is also looking good despite the (really) young pair on that line. Callahan is basically the anchor there.
I'm surprised by the fourth line too. Halpern skates like hell in all situations and makes a lot of important non-goal plays. Asham is more skilled than I would have thought too, I just saw him as a nasty fighter, but he's got a very quick shot, good hands, and he has made some smart hockey plays. Torts typically runs 3 lines, but the 4 is getting more and more play as of late.