Okay, this might be a really stupid question, but I'm very, very new to sql2005 & have nile experience so here goes...Is it possible to register a sql2005 server on sql2000 Enterprise Mngr?
No, you can't register a 2005 server in EM. You can though connect from Query Analyzer to a 2005 instance, but some (new) functionality will not be available and some keyword highlighting won't work.