For those of you who get confused by the plethora of Expression family products (Blend, Encoder, Web, Design, Media, Studio), here is one post written by Mike Ormond with purpose to try and simplify things as well as to provide a “jump-start” for some of the individual tools.
Starting from the beginning, Expression is our brand for more “design” oriented products (as distinct from Visual Studio as our brand for development related products). Now that’s a gross oversimplification and it would probably take roughly 2s to shoot holes in it but I like simple things and I like buckets so there you go. The Expression tools are currently at version 2 (in fact most, if not all, are v2 Sp1). Version 3 is imminent.