Remember the Milk
Your to-dos will definitely get done with Remember the Milk, which lets you organize your tasks by day, priority, type (work, home, kids) and more. Find yourself in town with half an hour to kill? Look up your to-dos by proximity to where you are (via GPS) and check them all off your list. It also offers the option to send yourself reminders by email, text message or instant messenger, and integrates with your Google Calendar and Siri on your iPhone.
The Catch: If you want push notification reminders and unlimited auto-syncing, you’ll need to upgrade to Pro for $3 per month or $25 per year.
Devices: Apple, Android, and Blackberry