Some issues have already been fixed. Here's one of the comment's from Philly 311:
Updated 3/14/09 7:05am: The Streets Dept has received the request
Updated 3/16/09 11:06am: The Streets Dept has received the request and created a work order of type: Potholes.
Updated 3/16/09 1:08pm: The Streets Dept reported that the pothole was repaired on Mar 16 2009
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Good Stuff Philly!