OpenVZ's Scott Dowdle created a 48 minute video that covers the basics about what OpenVZ is and then goes into a hands on demonstration.

1) Installing OpenVZ from scratch
2) Creating a CentOS 4 template cache
3) Create two VPSes
4) Examine the VPSes
5) Examine things from the host machine view
6) Examine things from the VPS view
7) Do an offline migration

Click here.  Or for a much better quality version of this video, right-click on the avi link and save as: openvz-introduction.avi