Get up to 10 additional user licenses for switching to Microsoft Dynamics™ CRM. With the Microsoft Dynamics CRM Switcher offer, current Salesforce.com customers can get either 5 free seats of Microsoft Dynamics CRM 3.0 Professional with a purchase of 20 seats OR 10 free seats with a purchase of 40 seats.
Details and the form for customers to fill out is located at: http://www.switchtomscrm.com/
Some of the fine print:
A Slick for customers is also attached.