Gmail users can now select multiple attachments and add them simultaneously to an e-mail message. The new system simply opens your operating system's file explorer, and supports selecting of multiple files at once. Best of all, it includes a status bar for each file as it uploads (just like does) to let you know how far along each file is. This can be comforting if you're adding a file that's close to Gmail's 20MB attachment limit, since you can see something other than a spinning loading icon. It also warns you if you're over the size limit before the files start moving, which is a nice touch.
One area where desktop e-mail programs still beat Gmail is letting users drag and drop their files, which has been seen to work on other Web storage and upload services using a Java applet.