I have all the CDs so far released by The History Book Man and they are a pretty good reference to Napoleonic Uniforms and to the individual armies. They're updated (expanded and improved) releases of out of print 1970-80s Uniforms Booklet publications by W J Rawkins.
They're available as online downloads too.
Take a look here:-
http://www.thehistorybookman.webeden.co.uk/