I think Jon Markwell's comment on Twitter sums it up really: "Something that's been on my mind for a while: Feels like the values of Twitter the company have moved away from those of the product we love" (http://twitter.com/#!/jot/status/81434698773049345)

Twitter-the-product is friendly, sociable and open. Twitter-the-company is increasingly evil - is the recent shift away from being developer-friendly with loose T&Cs to locking everything down something specific to twitter or is it endemic to a company of their size and a product of their growth?