A good app for listing books I own?

I have an iPhone 4 and I'm looking for an app that allows me to easily list the books I own, and (if possible) also categorise them. I have troubles remembering which books I already own and I keep buying copies I already have. I want to be able to search through my books by author or title (other categories would be great but not essential).
Free would be ideal but I'm also fine with paying for the app if need be.

Note: I've found that barcode scanners included in apps I've tried already don't tend to work for me - possibly because they are associated with American or European stock lists and I'm in Australia - so I'd rather not have an app that allows me to add books only via barcode scanning.

I use LibraryThing. It's online, but it helps me to track what I own and access it via the internet while shopping. It's pretty good for looking books up via ISBN, and you can export and download the data locally if you like.

http://www.librarything.com/

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