Easy to use CAD / architectural design sw suggestions?

[Bruce Labitt]

I need to make up a set of scale drawings for a workshop I'm setting 
up.  Does anyone have some experience with architectural drawing package 
that is affordable / cheap / free ?  I used to have an ancient copy of 
Generic Cadd that ran on DOS.  It was quite powerful.  Anything 
available for Linux?  I need a big step up from pencil.

Anyone have experience on getting one of the ~$49 CAD software packages 
for sale for that other OS to run in Linux?