K2.NET with VS2005; K2.NET with CAB

We're looking at embedding K2.NET workflow under VS2005 fat clients (or smart clients). I know that K2's SmartForms aren't working--is anyone doing this anyway? Any special gotchas I need to know about?

Anyone using K2 in within the context of Microsoft's Composite UI Application Block from the Patterns and Practices group?
(http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnpag2/html/cab.asp)

All encouragements/warnings invited--

Thanks,
Bob Dawson