oh! this is a fun one ;)
MS has a doc on this... and mike walsh, sharepoint guru, has a blog that comments on those procedures and tells you what to watch out for.
here is the MS article:
http://blogs.msdn.com/sharepoint/archive/2007/02/19/microsoft-sql-server-2005-sp2-reporting-services-integration-with-wss-3-0-and-moss-2007.aspxhere is mike walsh's commmentary on it:
http://mikewalsh.bilsimser.com/PermaLink,guid,3ff1194c-3b48-4f35-9797-a03327db8d00.aspxto verify it is working, deploy a SSRS report to sharepoint!