Each Google App Engine application has certain amount of free quota in terms of computing and networking resources. A good platform to try out new ideas.
I used to have PHP scripts on my machines to summarize newspaper headlines for me to glance through quickly. Since I don't host any machines at home anymore, the App Engine seems to be good fit to host the program.
The logic is simple. Just some Python scripts to parse xml or html pages. The UI is implemented with Bootstrap and jQuery.
Full source can be found on GitHub.
You can also try it out at https://news-sum.appspot.com/