The Google sketchup Resource Page

Getting Started with Google Sketchup-This link will take you to 28 introductory lessons, I will quickly walk you through most of these in class however this is your first place to go for trouble shooting.

I also have done a couple of examples for you. The first is what I consider the easiest project (the bookshelf end), the second I believe to be the most difficult (the crib board). Feel free to do one of these two or one of the intermediate projects.
The Bookshelf End

The Crib Board pt1
The Crib Board pt2