[Vipergrün]

There is also an oscillating floor sander, which would be more apt to "float" on the floor. Think of it as a large palm sander A lot will depend on how deep into the wood you need to go.

Here are sites with each type;

http://www.hammerzone.com/archives/flooring/hardwood/sanding/drum.htm

http://www.easy2.com/cm/easy/diy_ht_index.asp?page_id=35694049