Below are some tutorials for SketchUP, AutoCAD and Adobe Design Suite…

Google Sketchup: Download the free software
1.    http://www.sketchucation.com/
2.    http://www.architectionary.com/SketchupTutorials
3.    http://www.googlesketchuptutorials.com/

AutoCAD: Download the free 30 day trial
1.    http://www.cadtutor.net/tutorials/
2.    http://www.autocadcentral.com/Tutorials/tutorials_index.htm
3.    http://www.we-r-here.com/cad/tutorials/index.htm

Adobe Design Suite: http://www.layersmagazine.com/category/tutorials/illustrator

Adobe Photoshop:
1.    http://graphicssoft.about.com/od/photoshop/l/bllps5out.htm
2.   http://tutorials.intelligentedu.skillspride.com/free-photoshop-tutorials.html
3.    http://www.intelligentedu.com/free_photoshop_training.html

Adobe Illustrator:
1.    http://graphicssoft.about.com/od/illustratortutorials/Essential_Tutorials_for_Adobe_Illustrator.htm