I installed the new firmware version on my 800 last week and the camera continues to run fine. Thankfully, I had not been experiencing the focusing issues reported in this blog by so many. Interestingly, I bought this camera as Nikon refurbished equipment, as I did the D300 I own, and both have worked flawlessly from the beginning. Beginner's luck perhaps?
I will continue to run the 800 through its paces and report any anomalies here.