Now Gmail will start displaying all the email list when you click on To, Cc or Bcc links. Contact chooser will show all contacts and you can select by click on each contact or select all. So you will never miss any of your friends on a group invitation or sharing a interesting email.
Google giving more information about this new feature...
If you use contact groups, your groups will appear in a drop-down menu in the contact chooser, so you can select contacts from the groups you've already created. And if you happen to use Gmail in Chinese, Japanese or Korean, being able to pick from your list of contacts should be particularly useful since auto-complete doesn't offer the same search as you type experience that it does in other languages.
Official Gmail Blog: Composing a message? Try the contact chooser
If you use contact groups, your groups will appear in a drop-down menu in the contact chooser, so you can select contacts from the groups you've already created. And if you happen to use Gmail in Chinese, Japanese or Korean, being able to pick from your list of contacts should be particularly useful since auto-complete doesn't offer the same search as you type experience that it does in other languages.
