Remindium is a simple SMS based application to help you remember to do things. There have been many occasions that I, or somebody else has said "remind me later this afternoon" but to only forget about that reminder.
Schedule SMS reminders for events up to 18 months in advance.
No one likes getting tickets because they forgot to move their car. If you have a Twitter account, use the service to call you and remind you to move your car. To get started, just friend @Ticksuck on Twitter.