The Adafruit.com site is both a good site for purchasing your Raspberry as well as a welth of components for any type of project.
There is as well a lot of very good tutorials, but this time I would like to hint of their Alpha-version of a very nice Python development environmen.
The Adafruid WebIDE installes on the Pi and then you access it via your browser. Key advantages:
- Source file editor via a browser. Not need to ssh into the device and use vi or nane. Works with Safari on the Mac, but is optimized for Firefox and Chrome.
- Run and debug from within the browser IDE.
- Integrated support for source-code handling via Bitbucket. All your files are saved and versioned with a free personal account at Bitbucket.org.
The IDE even has event management feature that allow you to schedule program snippets to run at specific intervals.