I have a finished DVD in DVD Studio Pro. Now client wants a BluRay of the same authored DVD. I realize Studio Pro won't do this. I'm looking for suggestions as to the quickest/easiest way to get it into a BluRay DVD capable software. Ideas?

If you have Adobe Encore, it can Author BD content. You can even burn one to a standard DVD for testing if the content is small enough (which it must be if it is on DVD now!). You could then deliver the data on a hard drive to the replicators.

A few cautions:
-Apparently, Adobe Encore does not like Compressors h.264 encoding, so you'll have to use an MPEG-2 with a high bitrate.
-In the replication step, I've heard rumors about a $1500 cost for the copy-protection on a Blu-ray disc.