This has been my growing opinion anyway, nice to see Gartner is sounding off on this one.
Policies Must Enable Workers to Use Own PCs
Anarchy is at the gates of enterprise IT departments as employees use their own PCs for work. Enterprises wonder how they can allow access by PCs they do not own; the answer is that they may not have a choice. However, manageability and security depend on control of PC configurations and use.