GMail is getting more user friendly. Now it allows users to just drag and drop attachments to the composing window. This is one of the efficiency booster if you sent many emails within a period of time.
Presently this works only in Google Chrome and Mozilla Firefox 3.6. So if you are using any of this browsers for composing your emails then just try drag and drop to the email body. When you start dragging the attachment, you will get a drop here area in the email compose window.
Drop your files in that area, as you can see above, and your attachments are attached to the email. This is as simple as editing the email in your desktop email client.
Do you like this feature?