Microsoft have recently released information about the different
editions of SQL Server 2005 and the feature list of each edition. SQL Server 2005
now comes in 4 flavours, with prices ranging from around $4000 per processor for the
Workgroup Edition to around $20,000 per processor for the Enterprise Edition (CAL-based
licensing is also available). More details on pricing here.
A more detailed breakdown on what the different editions offer can be found at SQLIS.com