Thanks, Heck.
Heh... I wish I had that 600mm VR.
It's actually a funny story, I went up to this guy who I assume was a pro, he was shooting film with a Nikon F6 and the 600mm VR.
After some small talk he said if I wanted to take some shots, so he propped my D40 and the 600mm and let me take as many shots as I wanted.
I was using my 70-300mm that day for the other zoo shots I took.