I started writing an entry about the Prism data leaks, to try to pull together my thoughts, which were more or less that the information being released seems to be so vague that it's hard to know what to think.
But then I found
this article, which I think is the best summary I've seen so far.
The Guardian reporting is so woolly, it's kind of hard to work out what they are trying to say is happening, and the comments from British politicians I've seen so far - on all sides of the political spectrum - seem to be basically: 'I have no idea what this is or how it works, so here's my standard take on a general idea of censorship and state control of information according to my default political opinions'.
Edit : oh and here's a nice article showing how metadata could be used to identify individuals:
Using Metadata to Find Paul Revere