I'm a bit frustrated with Outlook and Google contacts, as neither understand that people share addresses, or that one address can represent several people. So you either have crappy custom fields like "Bill's mobile", "Jane's mobile", or you have a Bill and a Jane contact, and you have to keep the address updated between the two.

Are the any decent, and simple, address book applications out there which have this kind of intelligence?

Note: this is for home use, I don't need to do professional 'contact management'.