MMO-Champion is a news site in a blog/forum style. Its a great site for seeing whats coming in new patches or expansions, knowing who is getting first kills and seeing what Blizzard are posting on the forum. It has the original and best ‘Blue Tracker’ which tracks posts by Blizzard (which appear in blue text on the forum, hence their name) and it posts the best of these on the front page of its site. This site, more than any other, gives insight into the development process and why Blizzard make the choices they do, all neatly arranged.
WoW Insider is a nice compliment to MMO-Champion. Its focus is to bring you news, analaysis and opinion (just read the tag line). Its not as fast as MMO-Champion at posting new information, but you get the bonus of discussion and opinion. It also has ‘columns’ such as The Queue which is a Q&A column and class specific column telling you what changes really mean for you. With multiple authors there are lots of new posts every day.
World of Wacraft website (US | EU)
Whilst MMO-Champion draws its information from these sites, they are less useful because the information on them is scattered throughout the pages. However, these are the only sites where you can get the Official word. Whilst MMO and WoW Insider are reliable, theres a lot of other websites out there that aren’t and most major patches or expansions see at least one set of fake notes doing the rounds. Check here for the Official word.