Sometimes it's necessary or preferred to use some of the cool, collaborative features in Google Docs without having to log in with your Gmaiil address. Here's a great way to do it, by associating your non-Gmail address with your Gmail account.
If you want someone to share a Gdoc with you but use your work email for notifications, you can give that to them instead of your personal Gmail account.
I've given this to two different people this week and so I thought I'd blog it out to the world too.
Alternate email addresses are useful if you forget the password of your Google Account and now you can add more than one. In your account, click on Edit next to "Personal information" and associate additional email addresses with your Google Account. Note that you can't add email addresses already associated with another Google Account or Gmail addresses. After you associate an email address with your account, Google sends a confirmation message to authenticate that the address is actually yours. An added benefit is that your other email addresses are connected to your account and Google can use this information: for example, Google Calendar shows you the invitations sent to any of the associated email addresses. You can also log in by using any of the additional email addresses.