On Tom's recommendation I've tried Delta Cad and I found it to be easy to learn and quick to use for those of us who don't earn a living drawing parallel lines on a computer.
Earlier versions of AutoSKETCH can be found for very cheap and are extremely compatible with the multiple version of Windows software. I've run AutoSKETCH on 3.11,95, 98, MILLENIUM, 2000 and XP whithout a hitch.
AutoDesk has a program called VoloView Express (It's Free) and it allows you to zoom, pan and print many styles of CAD prints. It's a cheap way of pasting together a full set of plans from any DWG or DXF file. I've used this many times with great success.