I was watching PBS the other night; they were documentarizing about a concert pianist who had, for 35 year or so, lost the use of one of his hands (right?) to some sort of nerve disorder. Recently, docs were able to pinpoint a nerve that was causing his hand to contract involuntarily, and Botox it into relaxing.
The last time I saw my urologist, he mentioned that I could try getting a Botox injection in one of the muscles that inferes with peeing freely. I declined, but I reserve the right to reconsider at some point when the eeeeeeeeeew! factor fades a bit. The's procedure's legit, according to this study.