You can download the code that I used for my Windows Vista dev launch session in Delhi and Hyderabad from here.
For more on Guided Help, check out the ACW (active content wizard) team blog.
ACWStudio - the tool that I demoed, is part of Windows Automated Installation Kit which you can grab from here. Remember that guided help is not something that you can simply ship as a stand-alone download for your product. Currently, any custom guided help module, can only be deployed as part of your enterprise Windows Vista rollout. We do appreciate your feedback about how you would use guided help if it were to ship as a standalone SDK.