So I don't have a need for this yet, but I got wondering how I might build it should the need arise (which i have a project coming up that will certainly need it). I was looking at's mobile app screenshots today, and saw the common graph of total amount pledged by day. Aug 1st would show 100k, Aug 2 moves up to 101k, etc. So how would I prepare the data for a graph such as this with a data set in this form:

08/01/2012      |    1000
08/01/2012      |    5000
08/02/2012      |    50
08/02/2012      |    500
08/02/2012      |    5848
08/02/2012      |    3838
08/02/2012      |    138
Mini competition:
Who can beat r937 to the punch?