Google has rolled out what it calls an overhaul of Gmail Contacts with a number of added features.
- Keyboard shortcuts (go to Contacts and hit "?" for the full list)
- Sort by last name (look under "More actions")
- Custom labels for phone numbers and other fields
- The ability to undo changes you've just made
- Automatic saving
- Structured name fields, so you can adjust titles, suffixes, and other name components
- A bigger, more prominent notes field
Google offers more detail here.