Unladen Swallow looked very promising, came out with lots of excitement and news. It overannounced and underdelivered. I tend to prefer underannouncing and overdelivering...
Reminds me of OpenDHT, "a publicly accessible distributed hash table (DHT) service", which has since been taken down:
http://www.opendht.org/
I do think being able to store information without too much hassle is pretty useful.