Gee... David

I am struck by the likelihood that a substantial number of existing portals will need be upgraded. To this end I provide a link to what appears, on brief review, to be an excellent guide to the process. In a nutshell, this is NOT trivial and, in my view, if you are teetering on the precipice of installing 6.0, DON'T. You should go directly to 6.1. Despite all the usual caveats about waiting for the first service patch keep in mind that by the time your deployment begins to mature such a patch will most likely be in place. This chore and the risks of the unknown are by far out weighed by the complexity of the upgrade process.

Check out the PDFs in this link and see for yourself: Step-by-Step Migration Guide.