Ultimate Todos for iPhone

In my opinion the best (and free for a few days ! ) Utility for GTD for iPhone. It supports a lot of everything: contexts, tags, statuses, priorities, voice recordings in any task. The only pity is that the limitations of the iPhone do not allow to realize reminders. Deadlines are there, but you have to remind yourself to go into the program (as in any scheduler for iPhone).

Three main screens for work:
1. Dashboard (convenient groups - by status, by priority, by urgency, etc.)
2. Tags (convenient to use instead of projects)
3. Contexts

Supports two-way synchronization with toodledo.com (which in turn can be synchronized with Outlook, and much more).
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Everything else is well described and painted on the office .