I wanted to introduce to you my free, (hopefully) novel time-waster, TumbleDots. :)
The iTunes Preview link is: http://itunes.apple.com/us/app/tumbledots/id506161940?ls=1&mt=8
TumbleDots is a fast-paced match-3 game that uses your iDevice's accelerometer.
It should work on any iDevice with an accelerometer, and is optimized for standard and retina displays across the lot. It has basic leaderboards (with GameCenter integration optional).
I hope you enjoy it!