The best organizer application for the iPad is DejaOffice. This suite provides a calendar, notes, contacts, and a tasks list all on one application. Contacts can be sorted by a variety of ways to make searching for companies or individuals easier. The calendar offers day, week and month views and it also has a reoccurring event feature. Tasks and notes can be dated and linked to the calendar as well as sorted by color-coded priority levels. It is simple to use and it is free.