My results were the same for NYC... couldn't find any $10 dates in 2009 and couldn't find any availability at all in 2010.

Also just realized that I put Atlanta in my post above, meant to put Houston. Changing as we speak....

This is where I saw it: SlickDeals

ETA: The $10 promotion is now appearing on the www.lastminutetravel.com website's homepage.

I haven't gotten any network issues, at least not yet...