No, Canon to Nikon won't work.... BUT

YES, there ARE adaptors that will allow the use of Nikon lenses on Canon EOS bodies. I have seen them used by several former Nikon shooters who wanted save $$ when changing over to Canon 1D bodies.
The issue is the "Canon cameras have a shorter distance between the lens flange and film plane than Nikon". The adaptor is $200 according to this site: http://www.kenrockwell.com/tech/nikcan.htm

Having seen them used the setup does work, and in some cases the Nikon manual focus lenses actually work better on the Canon bodies... check it out.

JS