greasemonkeying my backpack

I wrote a quick little greasemonkey script (see davidfindlay.wordpress.com/2006/09/03/greasemonkeying-my-...) to sum the miles I've run in a given month for me. The script is adding the line in green to my Backpack running log. (The total in black is the hard-coded one I have been manually updating.) It's not exactly at a spreadsheet level of functionality, but it was a fun experiment nonetheless.