There is no need to use strong named assemblies in your MS CRM workflow processes. If you want to use unsigned assemblies, you just have to add allowunsignedassemblies to the root element of workflow.config:
<workflow.config xmlns="http://microsoft.com/mscrm/workflow/" allowunsignedassemblies="true">
Of course this is mentioned in the SDK. But since people keep asking this in newsgroups, I thought I could point it out here for those who don't know.
Hf ;-)