Don't forget about the User Guide that comes with the program - there is a lot of information there as well. The tutorial mentioned above extends the NextSTART User Guide by providing hands-on information regarding Hotspots and the Menu Editor.
The fabulous Tim Dagger (aka Essorant) is also currently writting a NextSTART/WorkShelf skinning tutorial - I'm sure it will be a great tutorial as well, and one long overdue...
Jorge Coelho
NextSTART 2.70 - A Windows interface that you can actually use!
http://www.winstep.net - Winstep Software Technologies
IRC Chat: #winstep on AustNet