Revit Architecture 2009 is out and has some pretty cool new features. The first one David Fano talks about is Sweep Blend. Imagine taking the blend tool and combining it with the sweep tool. It's pretty much just that. Like in the blend you pick to shapes "profiles" to blend between except now you can o it along a path. You could easily experiment with surface continuity by importing 3D curves from Rhino but for now this video covers the basics of how the sweep blend feature in Revit Architecture 2009 works.