MOTM

>... it seems it would depend on what type of wood,
>finish and feet (pure rubber, neoprene, vinyl,
>silicone, etc) that are used.

Yes, it apparently does depend on the materials. I've got an 
equipment rack with wood shelves on which the finish was dissolved by 
some rubber feet. The rubber feet basically melted their way through 
the clear coat, leaving indentations. The only fix would be to strip 
it and refinish it.

Cork seems like the best idea. Felt is too slippery.

John