A few days ago Shay Levy (from $cript fanatic) had replied to a thread on microsoft.public.windows.powershell detailing several methods of working with processes, some of which I had not seen before.  The best thing about it was the simple fact that he had compiled all of them in one place.  So I asked him to blog about it and then I helped him edit it a bit.  The resulting article should be very helpful to admins who want to start or otherwise control processes on their machines using PowerShell.  so if you have not checked it out yet, go read the article.