LinkedIn on Android is rather nice

Imagine if they integrated it into the Addressbook? When someone rang you, the phone could display: "Bob Bobson is calling, he is CEO of Bobby Enterprises and his last LinkedIn update is that he just sold the company for 15 Bobillion Dollars"

or even better

"Dick Dickson is calling from ITPeopleForHire, he has 6,000 connections on LinkedIn and you almost definitely don't want to talk to him".