In my use case, the most common date repeat rule used by authors is the "Repeats every day until". For example, an event spanning from October 2012 through April 2013, read something like this:
Repeats every day until Tue Apr 30 2013 .
Date is an awesome module, but this isn't an awesome way to show a date range. Let's change it to something like this instead:
October 5th, 2012 - April 30th, 2013
Looks better, eh? Charming, indeed.