[Yaaarc] Free CAD package links

[Keith Mc. (Route-To YAR)]

Another of my lists mentioned these links to quite a number of FREE
CAD systems of various flavors (Electrical, PCB, architectural, etc.)

-  http://www.freebyte.com/cad/cad.htm

-  http://sketchup.com

Would anyone like to recommend any of these (or simply share 
their experiences with them) for:
a) shared robot drawings (a generic 3D solid modelling preferred), and
b) schematic capture / PCB layout / netlisting?

Thanks!

- Keith Mc.