Contacts delegation allows enterprise users to delegate full access to the contacts in their “My Contacts” group without granting access to their mail or anything else in their accounts. […]
To save users time when locating specific delegated contacts, we’ve now added search functionality. Delegates can search delegator contacts by selecting the delegator contact group in the navigation pane, and then searching.
It’s not the most exciting of new features, but is one of those small things that can make a worthwhile difference to a PA who might have to contact a dozen or more people a day – and every improvement like that helps Google build its case for broader enterprise adoption of Google Apps.