I truly love this road.
Here's a few links that you may find useful.
The book:
http://www.amazon.com/Bicycling-Ridg.../dp/0897323017
And while I linked it from Amazon you can find it a many local bookstores.
NCDOT has some suggestions and a nice map.
http://www.ncdot.gov/bikeped/bicycle/blueridgeparkway/
http://www.nps.gov/blri/planyourvisi.../blrimap-2.pdf
Blue Ridge Parkway Advocacy group:
http://www.blueridgeparkway.org