Fans of the marble/labyrinth games should note that there's a newcomer in the App Store and it's actually pretty nice. Wooden Labyrinth 3D [App Store] offers 100 levels of tilting fun but adds a 3D twist. Besides the traditional 2D levels, it also offers platforms and obstacles that must be jumped over by simply shaking your iPhone.
The game also provides a 3D perspective that shifts with the tilt of your iPhone. It can be seen clearly in the video (below). The game plays well and "feels" right. It also provides plenty of calibration/sensitivity options.
The developers plan to offer a level editor in future versions. The price is $2.99 at present but will go up to $3.99 with the addition of the level editor.
Overall, a very well polished version of labyrinth that adds some interesting features over its competitors.
App Store Link: Wooden Labyrinth 3D, $2.99