not sure I understand this but I am going to throw my assumption out there:
SQL Server 2008 Standard & Enterprises editions are for running full database services on server (not just but for comparative sake),
and SQL Server Developer Edition is what, an IDE for developing programs around SQL Server???
not sure I understand?
Developer Edition is just Enterprise Edition without the license to be used in a Production environment. Also, it doesn't need to be installed on a Server OS (ie, you can put it on Win7, Vista, XP).