Yahoo! is currently polling some of its Mail users about what they would want in exchange for making Yahoo! their primary search engine. Some offers that Yahoo! is tossing around are:
Unlimited Mail Storage, Use Outlook or Outlook Express to manage their email, 5 free music downloads per month, discounted music subscriptions ($3.99/mo. VS $6.99/mo.), donations to charity, PC to phone calling credit worth $5, Netflix discount, discounted Yahoo! personals subscription or frequent flyer miles (250/mo.) which would be transferable to most major airlines.
Yahoo! said it was too early to say if they are going through with the plan, or which incentive they would choose if they decide to do the incentive program.