Here are some more updates Google included in the Gmail update today:
Embarassment-reducing new message notifications
Ever replied to a message only to find out that someone sent a better, smarter reply right before you? Now, if someone sends a reply while you’re in the middle of reading a conversation (or replying to it), you’ll get a notification that a new message has arrived. Click “update conversation” to see what youâ€™ve missed.
When viewing a conversation, use the new â€œForward allâ€ link on the right if you want to forward the entire conversation instead of just one message.
Chat even when your friends are offline
Chatting in Gmail just keeps getting better. Now, if you’re chatting with a friend who goes offline, your friend will be able to see whatever you were typing the next time he or she goes online.