I like the concept of juggling the GTD habits since learning GTD is a lot like learning how to juggle. In the same way that one has to keep juggling the first ball while learning to juggle the second and so on, the same is true with the GTD habits. The hardest part about learning GTD is that it involves keeping all of the habits going as you continue to learn the new ones (e.g. emptying your head, getting your inbox to empty, getting actionables done, getting clear on projects, following up waiting fors, getting reading done, doing the daily review, and - the 'key' habit - doing the weekly review).

Here's a tutorial you may find useful located under the heading "Just the RSD Movie" (also available in PDF format):

http://homepage.mac.com/toddvasquez/Ready-Set-Do!/FileSharing80.html

GTD Connect at the DavidCo.com site may also be a way to acquire further resources for teaching GTD

http://www.davidco.com/connect/

Given the fluid nature of the Getting Things Done methodology itself, it might be best to balance teaching the core principles first -- e.g. defining next actions by location context -- and then following each one up with three or four different implementations of that principle -- e.g. HipsterPDA approach, Outlook plug-in, Moleskine notebook, Palm, Treo, PC, Mac, etc. The key thing is that when people learn the principles they know that there are many different ways that principle can be implemented. Then they can tailor the Getting Things Done methodology to meet their own, unique workflows.

Hope that helps.

Todd V