Over the years Collectorz such as http://www.collectorz.com/iphone-apps.php has always popped up when this question was asked.
Sorry, I have no need for that.
Bob
looking for an app that can be used on my iMac to store database of book collection and can be accessed by my iPhone. Bar code/ISBN scanner would be great. Would like to be able to use in a book store to find out if I have a book in my collection.
Thanks,

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic