From Penn State...
Editorial Style Manual is a useful resource to consult when trying to figure out the "official" way to spell or present something!
Glossary of Distance Education Terms is a wonderful collection of basic distance education terms (and definitions!) compiled by Michael G. Moore and Kay Shattuck.
Time and Date (A guide to time zones, calendars, and more)
Calendar Generator (create and print year-at-glance and monthly calendars)