Fast Add! (free, iTunes Link) adds basic contact information to your iPhone contacts very quickly. It adds first and last name and phone number with just a few taps, much quicker than the iPhone’s default method.
Open the app and three fields appear: first name, last name, and phone number. Fill them out and tap Add Contact and that’s it, your contact has been added to your iPhone contacts list.
The iPhone’s default contacts app is much slower because it requires you to open the app, tap a plus sign, tap Name, enter the name, tap Save, tap Phone Number, tap Save, etc.
If you make a mistake or want to add more information, tap Edit and you have full contact editing capabilities that match the iPhone’s contact app, including the ability to add a photo, email, postal address, ringtone, etc.
Name: Fast Add!
Developer: Carlos Perez
Price: Free
iTunes Link: 
#1 by carlos on December 13th, 2008
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Hi, I’m the developer and glad to see this detailed entry here, thank you for this write-up. I’m working on some neat updates to this app, I’m overhauling the appearance after getting all inspired at an Apple tech talk and adding a few requested features. I look forward to your feedback, I intend to keep it free.
Oh, and I also want to improve the startup time… if there’s any hardcore performance junkies out there familiar with the iPhone SDK willing to lend me a hand, I will share some of the infinite glory with you that comes with being an App publisher, HA!
#2 by Miguel Picker on January 29th, 2009
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Love your application but the embedded advertising is like a slap in the face! can I block it? Can I buy a version that spares me this revoltion?
M