FlickAddress - FlickAddress is an address book you master easily contacts in iPhone. You can smoothly call or email when dragging and grouping contacts. As groups can be switched right and left like you flick cards you can find easily many contacts. As FlickAddress uses iPhone standard contacts you can use it soon after installing
OmniFocus for iPhone - Winner of the 2008 Apple Design Award for Best iPhone Productivity Application, OmniFocus brings task management to your fingertips. Keep track of tasks by project, place, person, or date. Bring up a shopping list, agenda items to discuss at work, things to do at home, and any other lists you need
Pocket Informant Pro (iPhone/iPad) - Pocket Informant is an integrated calendaring and GTD-based tasks solution for the iPad. Our purpose is to fuse together best-of-class calendaring with best-of-class tasks into one great solution
BugMe! Stickies for iPhone/iPad - Make quick handwritten ink notes and reminders on the fly... set quick alarms, save notes to your Home Screen and share your "sticky" notes by email or Twitter...
TAKE NOTES..
CamCard HD for iPad - CamCard is a professional business card reader. Take a picture of a card with the iPad's camera and contact information will be saved in Card Holder or Address Book automatically. You can easily manage all cards in Card Holder by searching, sorting, editing, etc
Countdown tracks the dates that matter to you. Want to know how long until Football season? Or how many days until school ends? Want to know how long since Jr. was born? Or exactly how long you've lived in your home? Impress your beloved by knowing exactly how long you've been together. Track the minutes until the next huge Apple release
xPlan - With xPlan, creating, tracking and managing your projects will be much easier than ever! xPlan is designed to keep track of tasks and calculate a project's cost.
NEW: you can now import and export projects at MS Project format (XML)
If you are not a professional project manager, you probably want something that's easy to learn and inexpensive