Rich,
You might not need to bolt it down. I bought a 60 gallon compressor about five years ago. I left it on the pallet it came on and never bothered to bolt it down to the concrete. I have not had any problems with vibration. I use a short rubber hose to connect the compressor to the air dryer and other plumbing that pipes the air throughout my shop and garage.
One thing you should definetly do, whether or not you bolt it down, is to connect either a manual or automatic drain on the bottom. The petcock on the bottom of these things is next to useless. If you don't want to go automatic (cost appox. $40 - it drains the water each time the compressor cycles), Cambell-Hausfeld has a manual kit for about $10 that includes a small ball valve (quarter inch) that is much easier on the fingers than the petcock.
Automatic drain valves are made for working garages and/or people that do not want to empty the air out of their compressor on a daily basis to drain out the water. For large compressors (and my 60 gal. takes a while to empty) - it makes a lot of sense to go this approach.
Good luck and have fun with the new tool/toy.
Joe