I'm looking for the ultimate contact manager for iPhone use. I hate how you can't group contacts in the regular contact book. I have a lot of coworkers, teachers, friends and family that I need to stay in touch with. I need something that works on the iPhone 4 and it would be nice if I could also edit it on my computer. I also hate all of this automatic synchronizing since it usually causes more errors, I like to do everything manually to keep it right. It also needs to allow adding additional fields of info. I have read a lot of reviews, but I can't seem to find a good app.