If you are looking for 'device icons' (front/rear), then I'm afraid cisco is yet to provide those (at least till the last time I checked). The ones you put on a rack diagram.
However, if you are looking for icons that are put on network diagrams, they can be found here:
http://www.cisco.com/web/about/ac50/ac47/2.html
Regards
Farrukh
