Step 3: The Processing Side
Code to initiate twitter on start-up
Code to send a tweet (do a status update)
Code to catch a tweet (do a search for keywords and DM's)
Code to send and receive serial data from a microcontroller (picaxe, arduino, prop, bs2 etc)
Code to timestamp stuff.
Etc. etc. etc.
Please see the enclosed video. Watch what you want and take from it what you want. There should be something for everyone in there --like I said, take what you would like and disregard the rest.
**NOTE** I have no idea how to do that screen-grab video capture thing.