As part of our upcoming remote managed services offering using Operations Manager 2007 with Essentials 2007, we'll be including the capability to use Remote Desktop to troubleshoot end-user problems without needing to have connectivity from the service provider's network operations center to every computer in the customer's environment.  Remote Web Workplace (RWW), developed by the Small Business Server team at Microsoft, provides this capability by proxying the inbound Remote Desktop requests so that all connects go through the Essentials server.  With RWW, service provider's will be able to Remote Desktop to all of the Windows operating systems that support it (Windows XP, Windows Vista, Windows 2000 Server, Windows Server 2003.  Remote Assistance is also possible by first using Remote Desktop to access the Essentials server and then using Remote Assistance from the Essentials console.  RWW is accessed using Internet Explorer across the internet, connecting to a secure web site hosted on the Essentials server.  RWW provides a list of all of the computers in the customer's AD forest, making it easy to find and connect to the right computer.  I'd recommend that you use the Web Page view in Operations Manager 2007 to create a RWW view per customer.  Here's an example of using RWW inside the Operations Manager 2007 console.