There's no way I can keep up with all of the activities surrounding the X PRIZE Cup. I'm already way behind with all of the news, even if I just concentrate on prizes. You should be able to get great updates and links to more updates from Space.com's X PRIZE Cup site, RLV News, Personal Spaceflight, Transterrestrial Musings, and Leonard David at LiveScience.
Also check the X PRIZE Cup site (see the new Rocket Racing League logo/link!) and the Northrop Grumman Lunar Lander Challenge site.
Here are some brief updates the morning before the X PRIZE Cup.
Lunar Lander Challenge Plans - Personal Spaceflight - Armadillo's schedule, and representatives from other LLC teams
X PRIZE Cup Media Day Photos - Personal Spaceflight - Get a sneak previous of what some of the displays and vehicles look like.
Wired Blog on X PRIZE Cup - It's already full of posts and pictures from the events so far - a half dozen posts yesterday. The link is from RLV News.
The X PRIZE Foundation's William Pomerantz posts on the details of the Lunar Lander Challenge rules, and why they were made the way they were.
X PRIZE Cup Media Day Posting - RLV News - gives lots of links related to the upcoming X PRIZE Cup, the Rocket Racing League, and a Diamandis interview
X PRIZE Cup Press Conference - Part 1 - RLV News - this featured a lot of the players in the Lunar Lander Challenge, including a Northrop Grumman (sponsor) representative, Will Pomerantz from the X PRIZE Foundation Space area, and representatives from Armadillo, SpeedUp, Masten Space, and Unreasonable Rocket.