So a friend and I decided to build a quick django site this weekend and this is what happened: http://semlinkchecker.com
It is just a simple site that checks to see if your urls are returning the proper status codes. Yes, there are a thousand other sites that do exactly the same thing, but what a great excuse to brush up on/learn python, django, aws, and git skills. We also connected it to just about every Google tool out there: Google AdSense, Google Apps for Business, Google AdWords, Google Analytics and Google Webmaster Tools.
One other reason to set it up is to learn a little more about improving SEO ranking. After only a weekend, we are the number one spot for "sem link checker," so now we have to try for some other keywords such as "link check" or "url validator."
Anyway, check it out, and throw some suggestions for other weekend projects my way.