I am going to be laying new tile in a bathroom, and I was wondering if I could lay the new tile directly over the existing, level bathroom tile. If the consensus is no, what is the best way to pull the old floor up with out destroying the sub floor?
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If the height issues aren't a problem, you can set new tile over old, assuming that the existing installation is sound, well-bonded, and without structural cracks. However, you must abrade the surface of the existing tile so that the thinset will bond to it. Mechanical abrasion with a carborundum disk is ideal, wash all the dust off with clear water and let dry. See TCA Handbook method TR712-01 for more information.
As to removing the existing tile, if you decide to go this route, the answer to your question depends on how the existing tile was installed. If the tiles were set on a thick mortar bed, you can cut the floor into pieces using a circular saw with a masonry blade, and then simply lift the sections out. If the tiles were set on backerboard, you will have to remove the backerboard completely and replace. Chances are you will also have to replace the plywood subfloor.