Almost 2 years ago I used this online training simulation to help a school district get their minds around a Novell migration project.  This URL has since eluded me and I've had several people ask about it.  I just stumbled upon it so I want to bookmark it here.

http://www.microsoft.com/WindowsServer2003/evaluation/demos/sims/migrate/viewer.htm

Want to see for yourself?  Start by opening "Step 1" and then click the link to start the animation "Introduction to Terminology."  That session alone is worth marking as a favorite.  The remaining portion of the training walks through the various migration tools provided at no cost, how they work, how they differ from MIIS, and it references a few good third party tools.

Once you're ready to play around, try out the virtual lab on TechNet to rehearse migration objects on your own hosted instance of a virtual machine.  I've referenced this before but no harm in posting the link again.

 http://www.microsoft.com/technet/traincert/virtuallab/nwmigrate.mspx

Other good info: http://www.microsoft.com/windowsserver2003/technologies/storage/default.mspx