Don Ferguson (IBM's Chief Software Architect) blogged over Christmas on the perceived complexity of our WebSphere integration products.
He's done a good job of explaining how they fit together and why they exist. That second point is the key: not all clients have the same needs or are starting from the same place.
It was good to see him mention a few of the new services in our Process Server product and what they're for. Selectors, for example, are key to our "versioning" and "dynamicity" stories - an area I spoke briefly about on this developerWorks PodCast.