I've since found the following...

sqlservercentral - licensing-sql-server-devtest-environments[/url]

...and...

directionsonmicrosoft.com - licensing-sql-server-development-and-test

...and all I can say is YUCK! MS you SUCK! :crazy:

If I have a SQL2008 R2 Standard Ed, clustered, in Production, then I want the same setup in at least one of the Test environments to mimic Production as close as possible to test on - I don't want Developer ed as this is 'different enough' for me to be wary of pushing something like a SQL Service Pack/Patch, for example, into this Test environment (into a Developer ed of SQL Server) before going to Production, which is Standard ed.