This is another presentation on Open Source hardware and Arduino. Check it out!
Here is a (html5) presentation that talks about the evolution of DIY electronics in the past couple years. Check it out if you like to see some of the latest cool electronics designed by people like you and me! (Link)
This is a nice overview video of Arduino & Android by Massimo Banzi at Android Open 2011. Check it out if you are new to open source hardware.