ORC Radio Chatter

I'm glad you got an Arduino and started playing with it.  Play around with a few of the starting tutorials to get a feel for things.  Then find a project to do. I have found you really don't learn much about these things until you actually do a project.  If you are looking for information on interfacing external hardware to microcontrollers check out my series of tutorials on the subject at www.w9xt.com.  Go to the electronics page. A link to the tutorials is near the bottom.  It is generic to micros in general but there are some Arduino specific tips.
Gary, W9XT