FWIW - recent builds of MC11 were doing a fine job of working with the Creative Zen Touch. MC11 identified it as a handheld device when it was plugged in, downloaded the Nomad plugin, and allowed me to browse files on the ZT and drop files into it. That worked thru build 127.
When I installed 129, I could see the Nomad plugin being downloaded, but nothing appeared under Drives & Devices, and clicking on Handheld Player in the Action Windows generated a "No handheld found" message.
I went back to 127 - not a clean install, just installed 127 over 129 - and everything was back to normal.
Had the same result tonight with 133. Just for fun, I did a pretty thorough uninstall/reinstall and still no joy with 133. Went back to 127 and the Zen Touch is back in the tree and files are happily copying.
I'm not sure what it means. Things are working great tonight with build 127 but I'll be a little leery about trying the next few builds unless something magic occurs to you. We're way overdue for a firmware upgrade for the Zen Touch anyway, so maybe it's a moot point until that arrives.