Just wanted to shower praise upon boost.units, which has finally filled a need I've had for a very long time. I am currently working with engineers to rebuild a simulation model, and boost.units has forced everyone to be consistent with their units... it has also forced the engineers to spend a few minutes arguing amongst themselves about the units of this variable or the other every once in a while... "is that a newton per meter squared?! No.. newton times meter... no it's... newton something else"... exactly what it should do! Good library! AJ