A Word 5 manual should give you plenty of dry reading for the foreseeable future.

My favorite manuals were always the Maxis ones. Sim Ant's manual was extremely informative about ant colonies. The one for Sim Life was just plain fun. Sim City 2000 gave you a lot of insight in its documentation while the original Sims had some humor sprinkled throughout its tome. Just imagine how great a Sims 3 manual could be...