from the cli
$ todo -i
Script asks you to enter tag, date and message, one item at a time.
cal, a cli calendar, will show the current, the last and the next months before you have to enter your info
Example:
$ todo -i Tag: bash Date task is due. (use *any* format): sat Message: the IRC bash meeting 19:00
Seems like the most easy way. I usually use no option. Why?