Effective Address Book

It has the ability to setup tasks and reminders against people (Note activities). This can then show pop-up reminders or sticky notes accordingly.
You can create rich text notes against your contacts to store memos, quotes etc.
You can instantly send emails and view websites of your contacts.
A new printing dialog means printing is now so much more customizable and easier to obtain good results.

Therefore, less wasted paper.
Searching has never been so easy. There is now an instant tree view of contacts shown based on your criteria.