Massive ransomware infection

There's a lot on news sources about massive ransomware attacks like this one:

Massive ransomware infection hits computers in 99 countries - BBC

But I've not seen a lot from informed sources yet.

But if you are interested in the highly technical side of "watching and analyzing here is a very reliable site just beginning to work on it:

InfoSec Handlers Diary Blog: Massive wave of ransomware ongoing