@magicalclick:Yeah. People will like it when their Metro App can dock on gadget container, and it'll make this feature available from Vista actually useful.
Also Metro Apps can run on virtual desktop (like the secure desktop where we receive consent prompt for UAC). Afterall we at most run one Metro App at a time. I think it'll be doable. And with some level of translucent background, it'll merge nicely with the look and feel of desktop.