Gtasks HD Pro - Google Tasks Manager for Todo List & Reminders (US $4.99 -> 0) for iOS

Copy paste from itunes.apple.com

Description
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• A single purchase covers all your iPhone/iPad devices -
  • gTasks is a powerful and intuitive tasks manager.
  • Supports full synchronization with Google Tasks (GMail/Google Apps) securely over https, naturally integrating into Google Calendar.
  • Repeating tasks (daily, weekly…), e.g. "Pay credit card" every month. Once completed, the task's date is updated to the next month.
  • Alerts for upcoming tasks including repeating alerts for repeating tasks.
  • Location based alerts*, such as "When I arrive home", "When I leave the office" or "When I'm nearby the shopping mall".
  • Multi-level sub-tasking.
  • Universal app - designed both for iPhone and iPad, neat and clean user interface.
  • Very clean, responsive (fast) and intuitive user interface.
  • Customizable tasks view & full search support.

• Location based alerts: Due to hardware limitations, this feature is available only on iPhone 4 and above, iPad 2 3G and above, running iOS 5.0 and above.

Optionally, you can sync your tasks with Google Tasks.
Google Tasks is available in free GMail/Google account or Google Apps account.
Syncing your tasks with Google Tasks has the following benefits:
• Sync your tasks between your iPhone and iPad devices.
• No permanent internet connection required. gTasks will sync updated tasks as soon as an internet connection is available.
• Your tasks are backed up.
• Manage your tasks conveniently on your home/office PC, and have them synced to your iPhone/iPad and vice versa.
• Have your tasks in your Google Tasks and Google Calendar.
• Share tasks with your colleagues.

Check out this video at:
http://www.youtube.com/watch?v=Dr-cHRmOfwg