On some summer evenings there is public viewing with the 36" telescope.  I was fortunate enough to attend one of the "Music of the Spheres" programs in June, 2002.  This included a concert, a lecture by one of the staff astronomers and viewing through the telescope.  On the night I was there, a gibbous moon was high in the sky. As this pretty much precluded deep sky observing,  the moon was what we saw.  It must be said that the lunar surface did not seem particularly more impressive here than with, say,  a six inch reflector.  The moon is the one celestial object that looks good with almost any optical equipment.  It is almost a fractal effect - with the large scopes you are seeing more detail, but a close-up of a small crater looks, to the untrained eye, pretty much like a low magnification view of a large crater.  However, one bonus of lunar observation is that lights are kept on in the dome, allowing for some photography.  As can be seen from the images below, there were clearly many satisfied customers.