Mininova has deleted all 'copyrighted' torrents from their site. They decided to do this after a failed attempt at filtering out certain torrents. Unfortunately, they had no choice but to carry out this drastic action as they had lost a court case and were ordered to remove all offending materials or face a massive fine of up to 5 million euros. It's not quite all over for Mininova, they are possibly going to make an appeal but I wouldn't get your hopes up if I were you.
This is a massive blow to the file sharing community because Mininova was the biggest collection of user submitted torrents. A lot of people like myself will now be looking for alternatives. Of which there are plenty, so have a look at the sites below and see which you like best.