Google Gmail Blog's new announcement says that Google have made the Gmail loads quicker by 20% and members who are accessing to Gmail at a slow internet connection would get a better loading speed.
Gmail latest addition is label colors: you can now set a different color for each label so you can identify messages easier. Not all Gmail accounts have the new feature, but it will probably be enabled for everyone soon.
"This updated Gmail Chat includes two features that were already available in the gadget: smileys and group chat. To invite a new contact to an existing chat, click on "Options" and select "Group Chat". The problem is that your contact must use either the gadget or the new version of Gmail. If he uses the desktop client, a message will inform him to open the gadget, but in the old version of Gmail Chat there's no indication that you invited him to chat."