I have recently posted a question regarding the Windows Workflow running in a web application. Granted it was a fairly technical question that contained terms like ManualWorkflo
My experience was simillar to Out Into Space, we had looked at using WF to control a compelx and varried ordering process, in variuos B2B scenarios. Last I heard they were in the process of gutting it.
I think it is hard for many developers to think in terms of workflow.