As a designer, I do a lot of drafting. AutoCAD and Google sketch up are the ones I use most often. When I draft things to build I prefer to use AutoCAD, but recently I was in between computers and had to do my construction drafting on Google sketch-up. Because Sketch-up happens to be one of my favorite things--- yep you guessed it. Free.
Sketch-up is challenging to work with when adding dimensions and labeling tends to float around in a weird way if it's in 3D. Google sketch-up is, however, amazing for doing 3D rendering of locations. It helps me wrap my head around where the camera will probably be placed in a room, and figure out what will realistically be needed as far as set dressing is concerned.
The following plates are from a flat I designed for a nursing home's community enrichment project. It shows how to construct the facing, the stands, and how it should look all together and I added nailing patterns and everything since real-life carpenters were going to be putting it together.
They did a beautiful job, BTW.
To make this took hardly any time and in about half an hour I had something to submit.
I'll put up some more examples of google sketch up renderings for you next Thursday. Keep and eye out :)