You should now have your client PCs configured to use SBS 2008. Since the users now belong to the SBS 2008 domain, policies about security, access times, and well-being can now be centrally controlled. This includes ensuring that all their security updates are applied to keep company data protected.
As their files, if desired, are now backed up and managed by SBS 2008, even if a computer completely fails or is lost, users can work and see their files, email, calendar information, and contacts when using another user's computer signed in as themselves, and when they get a new computer it will all appear there too.
Users can also be productive in and out of the office with a range of remote access tools that SBS 2008 provides.
The next step in this journey is to understand how a user interacts with the services that SBS 2008 offers to ensure both the business and the users get the most out of the investment in SBS 2008.