How to add a second email address to your gmail account

Here's a handy tip I discovered - you can associate non-Gmail email addresses with your google account. What this means is, you'll be able to accept invitations to google services like google sites and google docs to non-Gmail email addresses.

Simply go here and add as many addresses as you like:
https://www.google.com/accounts/AddNonGmailAlternate

You can also send emails from Gmail that appear to originate from these addresses - simply check the Gmail settings for further information.