Gmail gets new features
Second is a slick new 'Update Conversation' button for when you're in the middle of replying to a conversation, and new messages arrive mid-reply. A notification will pop up now, with the option of updating the conversation in-line to see what others said in case you need to edit your response.
Third is a new button to Forward All messages in a conversation, not just the one you happened to click the Forward button on. This is another great and innovative feature I haven't seen done with other web services or even desktop clients.
Last but not least is an offline chat feature for when someone you're chatting with goes offline for one reason or another. Now, when your friend returns online, they can see whatever you said in their absence. You'll really have to watch what you say when connections get dropped now.
All in all, these are great functional updates to a web based email client that is still trumping all the desktop clients I'm trying out. Nice work Google.