Summary and Other Graphics Freeware
In summary, the Serif programs are not usuable for commercial purposes and Inkscape and Scribus are so amazing, that it’s pretty clear cut which programs to choose.
But there’s some more graphics software you could look into:
Poster Forge - Looks to me like a great way to go for movie posters! Go to http://www.ronyasoft.com/products/poster-forge/
Google’s SketchUp - A planning software for building. Sounds like it would be good for architects. Go to http://sketchup.google.com/