While not strictly a mobile topic, I’m filing this under Mobile because it helps you BE mobile!
Saint Louis University has published a super-small 2008 calendar but not in a form you’d expect. It shows what day the first of each month falls and the date of the first Sunday in each month. With some very rudimentary arithmetic, you can easily compute other days/dates
Instructions and a downloadable PDF are here.
(From Lifehacker.)