Let's Make Robots!

Basic "Start Here" Robot (with Arduino)

I am brand new to robotics and I am about to try and build my first robot as a learning experience to get familiar with the basics (based on the "Start Here" design by Frits). I'll be using and Arduino Uno board instead of a Picaxe however.  After reading some other posts I have come up with a list of parts and several questions. I actually have some of these parts already but wanted to sanity check that I am on the right track. I am pretty comfortable with learning the programming aspect of this but want to make sure I have a good start on the right hardware configuration.