i saw an early version of this while they were still developing it and it looked awesome. it has a workflow designer tool (similar to biztalk orchestration tools) that allows for gui design of the workflow and the integration is pretty good...
so if you are looking for an easy solution or an easy solution to help you develop your own workflow, check out K2.NET
looking for a “what does sps have that wss doesn't” and vice versa?
if you are a .net winforms dev person, this stuff is cool...very cool.
check out the video: clickonce media on demand for msdntv