How do I import addresses into my Contacts list?
http://gmail.google.com/support/bin/answer.py?answer=8301
How do I import addresses into my Contacts list?
You can import address books from Outlook, Yahoo!, orkut and other services to your Gmail account by uploading CSV (comma separated values) files.
To import contacts to Gmail:
Create a custom CSV file or export the address book from your other webmail provider or email client as a CSV file. (Additional information on exporting and creating or altering .csv files is listed below.)
Log into Gmail and click 'Contacts' at the top of the page. The Contacts list will open in a new window.
Click 'Import Contacts.'
Click 'Browse' and locate the CSV file you wish to upload from your computer.
Select the file and click 'Import Contacts.' After successfully uploading the document, a dialogue box displays the number of new entries that were added to your Contacts list.
Gmail only imports contacts that contain email addresses. If some entries aren't included in your Contacts list, Gmail will tell you why these entries were left out.
Because Gmail does not offer group or distribution list functionality at this time, this information won't be transferred from other address books into your Gmail Contacts list.
Please note that if you import information about a contact that matches the email address of an existing entry, only the most-recently uploaded version of that entry will remain in your Gmail Contacts list.