I'm a little biased but there's an unlockable mini-game in Debris which I think is actually among the best pick up and play games out there. Our next game will actually be a complete title based on that unlockable. When that arrives it will be one of the best choices to play when you've got just a few minutes to kill. Other titles I enjoy in short burst are Dropship (great game), X-Plane, Topple, and Cube Runner. I also enjoy BIA and other more intricate games but usually I'm quite busy so the 1-5 minute burst games really capture my attention.