The answer is correct and I would make just a small observation: the Developer edition of SQL Server 2005 has usually the same features as the Enterprise edition so consequently you can use database snapshots also on the Developer edition.
Cristian Andrei Lefter, SQL Server MVP
MCT, MCSA, MCDBA, MCAD, MCSD .NET,
MCTS, MCITP - Database Administrator SQL Server 2005
http://sqlserver.ro