I was browsing my typical batch of favorite blogs and I came across a post that discussed how to use Dropbox to centralize sketches.  Now, this is a great idea in my opinion as it allows me to work on the same file from multiple computers, back up the file, and keep a track of the different versions just in case I screw something up.  Here is a screenshot of my setup and a link to the author’s site.

All you need to do is click on File -> Preferences in the Arduino IDE and browse to the location in your Dropbox folder that you want to use for your Arduino sketches.  You can get a free 2gig account from Dropbox which may be plenty for most.