Looking for a to-do list program with a specific feature

[Eric Hanchrow]

Google Calendar does that (http://www.google.com/calendar)
-- 
Rarely do we find men who willingly engage in hard, solid
thinking.  There is an almost universal quest for easy answers
and half-baked solutions.  Nothing pains some people more
than having to think.
        -- Martin Luther King, Jr.
        from "Strength to Love," 1963.