Last Minute Eatin' has been running for over two months now and has tweeted over 1,500 tables since launch. LME knows exactly when and where tables are open, and you can now visualize these openings with the Last Minute Eatin' Explorer. Every day at midnight, LME checks availability for almost 1,000 restaurants on OpenTable, and the infographic shows which restaurants and neighborhoods have prime time (between 7 and 10pm) tables available. Read more about LME data and how it works.
And in related news, Tejal Rao wrote a great piece about Last Minute Eatin' and some other folks also tackling this problem: Coveted Restaurant Reservations Without the Groveling.