Tim Douglas, our marketing guy here at the Autodesk CPM division, informed me today that technically Buzzsaw and Constructware are not "ASP" solutions, as we commonly refer to them. They're actually more accurately termed "SaaS" or "on-demand." SaaS, in case you weren't keeping up at home, stands for Software as a Service.
This strikes me as a nitpicky but accurate distinction. Wikipedia, that 100% accurate online resource for those who have little time to fact-check, has something to say on the subject. According to the Microsoft categorization in that article, we're technically a Saas IV -- which sounds eerily like the name of a Soviet rocket.