Merge Bitcoin Mining with Fold at Home!
Folding@home work is not compatible with the required properties of the work that needs to be performed for bitcoin. In particular, the computation work required for bitcoin mining needs to assure:


(a) difficulty of getting a 'good' result
(b) ease of verification of a good result once it is found
(c) precise scaling of difficulty depending on total network power.


The folding@home problems provide neither assurance of difficulty nor are in any way easy to scale depending on network power (since each folding problem is unique). They probably do meet the (b) ease of verification, but not the other criteria.