You underscored my point exactly regarding WLMM. WLMM is a new version that will allow multiple users to run at the same time. It is modified to run using the fast user switch hack, or so I'm told. MovieMaker will not run multiple times on the same operating system. Neither would CCC, or Compass, or SuccessMaker, or ClassWorks, or Read180, etc. Whether they are good pieces of software or not, they are what we (and many other schools) have to use. They run fine on a normal Windows XP or Windows 7 PC, or a Fiddlehead PC, BUT NOT ON A THIN CLIENT, or MPS, or nComputing, or anything else that uses one operating system shared by multiple users.
I'm not trying to say what is better, or worse, it's just that everyone is comparing their product to everyone else's product. That is fine, but none of them run just like a real PC... except a real PC, and Fiddlehead. That is my point. They are not like a real PC. They all have only one IP address, one MAC address, they can't get some applications to run, security issues because of the sharing of .ini and .dll files across users, problems with USB device security and attachment. ...on and on.
I wish we didn't need good multimedia, nor did we need applications that ran on Microsoft. But we do! If we didn't, I would just run LTSP and be done with it.:)