I've been playing Metroid Prime. Back when I was a kid first playing the game, I never made it past Flaahgra, so most of the game is new to me. I'm blown away by the level design in this game. The areas are a joy to navigate, with lots of verticality and paths that twist back on and over themselves. It feels like kind of like the half-way point between Ocarina of Time and Dark Souls.
I also finished a game of Invisible Inc. It's a really elegantly designed tactical game with a sort of X-COM-ish mission structure. I played a game on easy mode, so it will be interesting to see how the game plays on the harder difficulties (fortunately, a game of Invisible Inc takes about 4 hours, so it lends itself to multiple playthroughs).