You can use phrases like monday, next month, etc. to set the due dates for items. This only works when viewing the To Do list in Mail and double clicking on the Due Date column. It does not work when you select Edit To Do... on this same view, or when you select to change a To Do date from a Note, Mail Message, or iCal. I find this quite handy, but I wish it was everywhere, and that it supported all the date-related data detectors (maybe that's coming). Also, if you put a number of any sort, then the text portion of the data entry is ignored. For example, entering 2 weeks sets the due date to November 2, which is the same date you get if you just type 2.

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