Walt's Time-of-Day Clock:
I had a friend who required a clock app with a resolution of .1 second, so I wrote this app for him. His need was to take a slow motion video the clock next to a meter so he could precisely time events with a resolution to the nearest 0.1 seconds.
Each 0.1 second this app updates the next time slot on the screen. Even though the screen shots show a lot of variance on int he 0.0x and 0.00x fields, on a real device these numbers are typically 0.