Written in PHP and using cURL, this script imports the names and email addresses from your yahoo account (yahoo id and password needed to login to yahoo from the script and retreive the address book).

PHP Import Names and Email Addresses from Yahoo Address Book

It adds @yahoo.com to yahoo id's that do not have email address associated (Usually yahoo id's have yahoo email). This script will accept international yahoo ids such as yahoo.co.uk and the like. Also should work with sbcglobal.net accounts.