BubbleTown is a puzzle game for the iPhone and iPod Touch. This game has a lot of similarities to Snood, but includes plenty of really interesting things to keep the concept different and fresh.
BubbleTown has an entire story you can follow that will actually explain a little bit about each of the pieces and the roadblocks you're going to face as you go from level to level. It's definitely an interesting approach as opposed to simply putting a puzzle in front of you and not providing any other information. Unfortunately, this isn't as in depth a game as Puzzle Quest, so having a storyline to it doesn't really add a ton for the average player.