Stumbled upon a tweet the other day for a Touhou Cirno clock in Apple’s App Store. It’s nifty and free! Downloaded it for my iPod touch. However, I’d imagine it’s probably only available on the Japanese iTunes store. Could be a world-wide downloadable thing though, I totally didn’t think to check. If you don’t have a Japanese iTunes account, you can get one by redeeming a Japanese iTunes prepaid card.
If you missed the link, here it is again: http://www.appbank.net/2010/09/17/iphone-application/162329.php