OmniFocus is a task manager that will keep track of all your actions by project, place, date or person. It can bring up a shopping list, tasks for home, agenda items for work, and about every other list you may need.

OmniFocus for the iPhone brings task management to your fingertips. Keep track of actions by project, place, person, or date. Bring up a shopping list, agenda items to discuss at work, tasks for home, and any other lists you need.
Using your location, OmniFocus can create a custom list of actions to complete nearby. Buying groceries? OmniFocus can show you the closest grocery store and create an instant shopping list.
Capture tasks anywhere, anytime with OmniFocus: you can enter text, take a picture, or even make a quick voice recording.
OmniFocus is going to be available in the appstore begin July.

Some screens.