One of the topics I had trouble with when studying for my JNCIE-SP exam was Hub and Spoke MPLS VPN. The education services slideware is good, but I wanted a more thorough example of how to set it up. I'm working on a multi-part series on my blog. The first post is up, and covers the theory:
Hub and Spoke VPN Part 1 | SubnetZero
The second post covers H/S with BGP as the PE-CE protocol:
Hub and Spoke with BGP | SubnetZero
I am working on one that covers H/S using OSPF as the PE-CE protocol. Just posting this to help anyone else who might be struggling. Feel free to let me know of any errors or suggestions on the docs.