looking for a simple cad-esque type program to help me visualise re-arranging my house.
need to be able to specify dimensions of rectangles, doesn’t need to be 3d, and need to be able to drag/drop objects.
pretty simple, just can’t seem to find a really easy-to-use program… I have the GIMP but I’ve never used it before 
You could have a look at http://sweethome3d.sourceforge.net/. I have not used it but happened to notice it recently in a list of available packages. (It has 3d capabilities but the description mentions 2d too.)
I’ve used a program called room aranger before now, both to lay out a new room and to plan a whole factory. It has standard objects like furnature and you can make your own things, also allows an export to create a 3d view of it via your web browser.
cheers, will give those a try 