Heroes: Well, that was a waste. An hour of convoluted time travel nonsense, just so Magneto can give Peter's Irish Barmaid a roommate? Throw a non-plot in with HRG non having an affair with a co-worker, just so we can get the awesome verb "Haitianed"? Meh meh meh.
Castle: Way better, as the scenes with Alexis continue to be good. Her assisting with exposition at the beginning of the episode was not only helpful to the police, but now Beckett sees the "Adult" side of Castle. Good scene, and set up fairly naturally with the characterizations we've already had working. Them's some good writing.
Story itself was okay, the usual parade of suspects and false leads. Figuring out the murderer from her final song was a little of a stretch, but Alexis reaction to the "cross her threshold" line sold it at the end. Good all around.
How I Met Your Mother: Ted (or, T-Mos) has been waaaay in the background the last couple of weeks as Ro-Ro and the Barnstormer are attempting to challenge Lilypad and Marshmallow for the title of Best Couple. Barney and Robin's methods for avoiding fights are great (Barney leaves, Robin strips), as was the situation in which neither method can be used (stuck on a ski lift). Marshall's speech to Barney about how he's forgotten more about being a good boyfriend than Barney will ever know was greatness, and it's great to see more Marshall after he was barely in some of the early episodes. The "bagpipes" gag was funny once or twice, but it's no "eating a sandwich". Upswing for the season, but still kind of treading water, plot-wise.
Coming next: Double shot of FlashForward, and eventually, V.