tinydb.org: This is the first Google App Engine app I’ve seen.
tinydb lets you write to it by send a small GET request with querystring arguments containing some bit of textual data. You get a URL back, from which you can retrieve what you wrote in XML or JSON.
There’s no edit facility — once you write it, you can’t change it. You can write it again, but you get a different key back.
So, using nothing but a GET request, you can put a scrap of data into a global data store, and get it back from anywhere. Obviously, it’s not secure — anyone who has your URL can see it, and anyone can just browse existing URLs (the latest ones issued are even listed on the tinydb home page).
It makes me wonder about proprietary information and limits on data storage. What if someone puts a DVD encryption key in there? What if someone starts storing kiddie porn? How much data could someone upload?
Nevertheless, a neat little app and something no one would have been willing to do without something like Google App Engine — let them manage the disk space.