there is practically no difference between SPF 2010 & SPS2010 installation, except of some new error messages :)
So here we go
http://<reportservername>/ReportServer/ReportExecution2005.asmx
4.step: Debug this code
5.step: Run Plugin Registration Tool and register new assembly (that will be dll created from this source in path where this project will be created in bin folder)
6.step: Create new Workflow in crm with this custom workflow activity as new step
And here goes full code: