Darren Gosbell has read my recent Experiences of processing in Analysis Services 2005 post and come up with a workaround to the problem I mentioned regarding generating the Process command - use Analysis Management Objects (AMO) to do the job for you. Darren has called AMO from PowerShell - thus demo-ing the capabilities of that particular technology as well!
I'm not surprised that someone has put this demo code together and, given that, I'm even less surprised that it is Darren :) Check out the post (with code) here.
-Jamie