While I haven't gotten in any RPing lately, I have gotten to game far more often than I usually do. A couple of weeks ago I got to play Betrayal at House on the Hill (which I keep wanting to call Betrayal at the House on Haunted Hill). This is a fantastic game where you build a haunted house as you play, until the betrayal happens, and the game completely changes. Now this first part of the game is great, because the house is never the same. It's built room by room from a deck of possible rooms. Each room has it's own special rules, encounter, item, or omen. When the omens are pulled, it causes a haunt roll, which will eventually reveal the betrayer.
Depending on when and where the haunt happens determines which of the 50 possible scenarios occurs. That's some serious replay potential.
In the 3 games we played we beat back demons and closed a hellmouth, aliens abducted everyone, and we defeated a dragon.
The second game we played (with the aliens) the haunt happened really quickly, and because of that the house wasn't very explored, and no one had any good equipment to try to stop the aliens. Needless to say, it did not go well.
This is a great game, and I can not recommend it highly enough.
If you'd like to see how the session runs, check out these episodes of Table Top.