Apple is offering several incentives to entice .Mac users to renew their memberships. Those who renew will have their choice of a free copy of The Sims (US$49.95 retail value), a free copy of EverQuest ($49.95 retail value) or $20 off a purchase of more than $20 at the online Apple Store. Earlier today, we noted Apple’s new “refer a friend” promotion that saves you 20 percent on your next year of membership for each person you get to sign up for the service — sign up five friends and your next year is free.