When working with MOSS / WSS you need to find out the Public Key Token of your assembly for a feature, manifest or the web.config file. One of the ways to retrieve the Public Key Token is to build the project (making sure the assembly is signed) and drop the assembly in the Global Assembly Cache (GAC). You can however use the SN.EXE (.NET Strong Name Tool) with the -T parameter (please note the

Read the complete post at http://dhunter-thinkingoutaloud.blogspot.com/2007/07/tip-quickly-find-out-assemblys-public.html