ThumbCal is a customizable fingerfriendly calendar application for Windows Mobile Pocket PC’s. You do not need your stylus anymore to navigate through months and years, tasks and appointments or to quickly create or delete them.
ThumbCal is free for personal use.
As of now there is no changelog available – the release thread with the announcement of v0.5.1 is here -> http://forum.xda-developers.com/showthread.php?t=373971