A link to a new website is on the Education NXT blog. Check out the announcement here.
UPDATE: This is from Lisbeth, at the Education NXT blog:
"The site discussed in the post about ROBOLAB 2.9 is not the Carnegie Mellon site introduced in [this] post. Carnegie Mellon developed the new curriculum, and this site features the NXT with that curriculum. The site listed in the ROBOLAB 2.9 post is affiliated with Tufts University (creators of the ROBOLAB interface), and addresses the issues of transition from ROBOLAB 2.5.4 to 2.9 to NXT. That site is not live yet. As soon as it's up, though, we'll post the link!"
Thanks, Lisbeth, for the clarification!