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Thrillist San Francisco
Tixsux
Billing themselves as "An End To Parking Tickets", Tixsux'll call and remind you when it's time to move your rig. Just follow them on Twitter (they'll follow you back), private message them your number and the date/time you need to move, and an automated voice'll ring you saying "you must move your car within the hour", but unfortunately not "oh, and remember not to feed your kids".
