“The new compose pops up in a window, just like chats (only larger). This makes it easy to reference any other emails without ever having to close your draft. You can even do a search or keep an eye on new mail as it comes in. And because the compose window works the same way as chats, you can write multiple messages at once and minimize a message to finish it later.”
Source : http://mail.google.com/
Google has added yet another security feature in Gmail that helps you to track recent sessions & sign out remotely. You can access this feature by clicking on the ‘Details‘ link in the footer, it will show your latest activity & locations where your email can be accessed.
you’ll be able to find the IP address and the date of the most recent activity in your account. If you find any malicious access to your account, you can sign out immediately by clicking the Sign out all other sessions under Details link.