I have used many contact management programs over the years and this one rates at the top for a single user program. Easy to use, very intuitive and jam packed with features that you would find in much more expensive programs. I have been putting this program through it's paces and it has worked flawlessly as it interfaces with Address Book.

Alan Cook the designer is the most responsive designer of any software program I have ever requested information from. It is almost like he lives on his computer awaits for emails so he can respond in record time.

This the program that Apple should have wrote and implemented into Address Book.

I recommend that if you need a 10.5 contact management program, which includes, contact info, notes, alarms and photo management, check this one out today. It is free for the first 21 days.