Out of the box, to do this you need to go into the homescreen settings and select TouchFlo 3D, or, deselect it, and reselect all your usual homescreen plugins - a bit of a pain.
However, I've realised that browsing to the "Manilla exe" in the Windows directory turns on the TouchFlo without affecting your homescreen plugins. If you then kill the manilla process using a a Task Manager which shows processes, you're straight back to your normal homescreen. I've made a shortcut in the Start Menu so I can toggle between the two relatively quickly and easily.
But, I'm looking for some clever person out there to make a simple app which toggles between TouchFlo 3D and normal homescreens at the press of a button. I'm sure it can't be that difficult (for someone who knows what they're doing)??!! It just needs to launch the Manilla exe and then kill it when you want to turn it off.
Anyone fancy having a go?