$1.99 from Silverware Software
Speed Name is the absolute quickest way to add a contact to your iPhone or iPod Touch.
All from a single screen, you enter the name, phone number, email and note. Then simply tap a single button to have that name added.
No shuffling between handfuls of screens. Simply enter the information in one screen.
Speed Name will even allow you to add, edit and delete groups for your Contact list.
Speed Name also provides easy filing of your existing contacts in to groups. You can choose which group to display the contacts for, even allowing you to display all the unfiled items in a list.