Are there any voxel based modelers?
IMHO it would be best solution for sculpting.
You might think the file size would be huge but 2 colour 2000x10,000 GIF is only 23 kb so 2000x2000x10,000 scene would be only like 50megs, it would be pure shape only, but i think it would be possible to also color the surface texels without bloating the file much.
Oh well, just some stupid smoke break idea
edit: changed the texel for voxel, stupid old head.
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(If you really want to make the big bucks learn that software)
EDIT: Nope. Sorry, From the way someone I knew described it sounded as if. (Above still applies)
http://www.sensable.com/products/index.asp