If you have .mac, you can now create email alias addresses - which point to your *name*@mac.com account.
So, for example, I joined .mac using my intials and surname - but now if I want I could set up an email alias such as "macplus@mac.com" and tell others to send me an email to this address. The next time I check my inbox (using Mail or via the web) that email will be sitting there (color coded) for me to read.
