Join 500,000+ artists on ConceptArt.Org.
Its' free and it takes less than 10 seconds!
Found this on Youtube.
Parka Blogs <- Most dangerous blog for artists (and their wallets).
good introduction to sketchup, was useful to me because I've just learned about sketchup and that video gave me a quick rundown of why I should use it. thanks
Check out Ctrl+Paint, there are several short beginner videos on using Sketchup in a Concept Art workflow: