It was time to do the decent thing and do an open source version...so here we go..
Diagram of the lab:

Basic setup of the lab:
Vyatta Cluster Part 1 - Basic Setup from Richard Vimeo on Vimeo.
Part two of the setup:
Vyatta Cluster Part 2 - Basic Setup from Richard Vimeo on Vimeo.
This is the juicy bit, where we setup VRRP, then Clustering and finally, IPsec site to site VPN. (There is some NAT in there too!:)
Vyatta Cluster Part 3 - VRRP, Clustering,VPN etc from Richard Vimeo on Vimeo.
This is where I try and break it!
Vyatta Cluster Part 3 - Testing from Richard Vimeo on Vimeo.
As ever enjoy! and let me know what you think :)