How To Import Contacts Into Gmail
There is a super-easy way to add your existing address book from your old email account (Yahoo, Mail, MSN, whatever) to your spiffy new Gmail contacts list. Here's what to do:
1. Email everyone on your list including yourself at your new Gmail address. Say something like: "I'm going to be switching email addresses to my new Gmail account. Expect an email from that account soon!"
2. Reply All to that email from your Gmail account. Tell everybody "This is my spiffy new Gmail account! Please email me at this address from now on."
Then everybody you emailed should be in your Gmail contacts.
BTW, importing/exporting contacts is one of the future promised features of Gmail.