One of my favorites, when you really need it, is a proper lug-wrench.  Mine is made up from Craftsman socket wrench parts:  a 19 mm socket, a 3" extension (to permit the force to be applied parallel with the face of the tire), and a 15" "breaker-bar" (or "speed bar" as they are called in the Sears catalog).  It seems to work well.

Fin Beven
Pasadena, CA  
'84 Vanagon GL (Customized for camping)
'90 Vanagon Carat (and camper-to-be)