When it comes to videos and pictures, I think the supply has pretty much been exhausted. With the exceptions of the CES 2006 (Jan) and the New York International Toy Fair 2006 (Feb), there doesn't seem to be any other demonstrations of Mindstorms NXT in a public setting. The Education NXT blog still seems to be posting some semi-regular information, but the official site hasn't had anything new since the Feb 12 announcement.
"The NXT Step" blog will be 'on vacation' from March 4th to March 12th. Please note that I will be turning on the "Moderate Comments" feature to prevent any abuses. I'll review any comments received on March 13th.
I've received numerous personal emails regarding my blog - thank you for the compliments. I hope to continue to provide news and information on NXT as it comes.