I was able to get my hands on a Blackberry Playbook today and had a chance to test our SharePoint service and Hosted Microsoft Access Databases. I am happy to report that the browser that the Blackberry Playbook uses seems to be completely compatible with SharePoint 2010. I was able to login to our demo site and load our Contacts Web Database right on the Blackberry Playbook. I took a quick snapshot on my phone of the database working on the Playbook. Very cool!