In April 2007, Cuban partnered with Mascot Books to publish his first children's book, Let's Go, Mavs!. In November 2011, he wrote a 30,000-word e-book, How to Win at the Sport of Business: If I Can Do It, You Can Do It, which he described as "a way to get motivated".
Also in 2007, Cuban was reportedly interested in distributing through Magnolia an edition of the film Loose Change, which posits a 9/11 conspiracy theory, with Charlie Sheen narrating. Cuban told the New York Post, "We are having discussions about distributing the existing video with Charlie's involvement as a narrator, not in making a new feature. We are also looking for productions with an opposing viewpoint. We like controversial subjects, but we are agnostic to which side the controversy comes from."
In February 2007, Cuban publicly criticized NBA Finals MVP Dwyane Wade and declared that he would get fined if he made any comments about what he thought really happened in the 2006 NBA Finals.
On September 12, 2007, Cuban said that he was in talks with WWE Chairman Vince McMahon to create a mixed martial arts company that would compete with UFC. He is now a bondholder of Zuffa, UFC's parent company.
Cuban followed up his intentions by organizing "HDNet Fights", a mixed martial arts promotion which airs exclusively on HDNet and premiered on October 13, 2007 with a card headlined by a fight between Erik Paulson and Jeff Ford as well as fights featuring veterans Drew Fickett and Justin Eilers.