How are "workshop style" lectures conducted? Descriptions of graduate (and advanced undergrad) courses sometimes indicate that the lectures are going to be conducted in a "workshop style". I am unsure what a "workshop style" lecture entails and how it is usually conducted over a two hour span? 

How does a workshop-style lecture differ from formal lectures?
Workshop "lectures" are less logically formal, less detail-oriented (but usually with careful references). The idea of a workshop is more top-down, more action-oriented, intended to get people up-to-speed on the current state of a topic (rather than, cough-cough, compliance-oriented). Examples, heuristics, prototypes, thought-experiments... more of the things we actually do, rather than the formal narrative reporting on it later and not-as-though-it-were-live.