I'm still skeptical about Portal 2. All of the reasons why I enjoyed the first one don't appear to be evident in what I've seen from the second one. I enjoyed figuring things out in Portal (a game that actually makes you learn sometime by playing it) and I feel like Portal 2 wants to hold your hand, guide you around and have you tell it how pretty it looks and how clever it is. I very well may be wrong, in fact I hope I am. I've just been burned by too many hyped games in the last few years.
As for Half-Life Episode 3, maybe I'm being a hopeful optimist here but perhaps there's some really crazy stuff at the end of it and they're going to try releasing Half-Life 3 shortly after (within a year, I mean)? Episode 1 and 2 were sort of self contained (had their own mini story arc). It would be nice if Ep 3 leads into Half-Life 3 with more of a cliffhanger ending. Just saying...