Surprisingly, WorkSpot's service offering does not make use of the Linux Terminal Server Project. Instead, they've created a modified version of VNC. In addition to their ASP service, WorkSpot has created the GNU Workspot Project. This GPL project packages their entire solution for anyone to use. They feel this project is a viable open-source competitor to Citrix MetaFrame and Microsoft Terminal Server.
Of course companies have to base their server-based computing platform decisions on the applications that they need. However, if a company only needs to provide basic office, web, email, and scheduling functionality for end users, a WorkSpot-based solution may be the answer.