Thanks again, all.
Wazza, the technique (not really a technique at all) is to find the right balance between sharpness and noise. If you start off in DPP with the RAW file, adding sharpening and contrast in too large an amount, you will end up with a grainy image. I'm finding myself putting contrast at about +2 in DPP (version 2.0.3.7), sharpening at 0 or 1, use only modest exposure adjustment if possible (I try to keep exposure adjustment to 1/3 stops or less).
After conversion to JPG, I evaluate and apply minimal noise reduction in Photoshop Elements 3 to get the grain down (usually level 3 or 4, 180, 70), then make a coarse, low-level sharpen in USM (25, 2.0. 3). Check levels, and possibly put a small "S" shape to the exposure curve with curves (I have PSE-3, but found a free "curves" plugin that is compatible). Sharpen again at a moderate coarseness (40-80, 0.7, 2), and again evaluate for noise.
Final sharpening is at 80-120, 0.3, 0 to get the final crispness.
I'm still tweaking my adjustments, and I'm finding that each image is a little different. I shot these at a moderately high ISO (640) because I'm using a rather small aperture (f/22-25) so I have to find the right balance between graininess and detail. If the moon were larger, it would be easier as I wouldn't have to present anything close to a 100% screen magnification as the final output. Plus, I wouldn't need to stack teleconverters on my lens, and thus could use a larger aperture and lower ISO. 
BTW, it does print nicely on 8.5X11 or A4.