This is not a new feature, but one that I recently discovered.
With a single gmail account yourname@gmail.com you can instantly set up many many more. How? The Magic lies in how Google handles extra characters in the username.
If your gmail = yourname@gmail.com then all of the following variations below will flow into your email account
your.name@ gmail.com
yourname+kidsschool@gmail.com
yourname+retalierwebsite@gmail.com
yourname+twitter1@gmail.com
and so on.
The other side of this is the ability to set up filers in gmail based on this. So you can choose to auto-delete emails or file them away, or apply a label to them. Like I said, not a new tip, but handy all the same
-Rudi