Do you flickr?
Rasmus Lerdorf has posted Flickr API Fun.
I like stuff I can pick up and do something useful with in an hour or two. Perhaps my attention span is too short, but if I have to read a 300 page spec before I get to Hello World, then it's not for me. Or you would at least have to pay me a lot of money to suffer through it. I think people refer to this as "immediacy". For me I think it is mostly lazyness. If I can't figure it out in an hour, it's broken as far as I am concerned.
I feel similar to Rasmus about things which one can pick up in an our or two.