What's the best book or website for absolute beginners?

I've got an Arduino board, a basic breadboard, soldering set and a few LEDs and want to make something :)

Amazon has a few Arduino books:

• Getting Started with Arduino (Make: Projects)

• 30 Arduino Projects for the Evil Genius

• Practical Arduino: Cool Projects for Open Source Hardware

• Arduino Cookbook (Oreilly Cookbooks)

I've got experience with radio control cars and basic soldering (changing battery plugs, rewiring speed controllers and servos, etc.) and eventually I want to build a MakerBot or RepRap - but before I get to that point I want to get comfortable with soldering small IC boards and stuff like that.