The latest builds of CopyToDVD and BlindWrite include an optional feature where a statistics database is updated every time the software is used. CDRInfo presents the first results, in a brief but hopefully interesting article. Take a look at the first 2-weeks data here
According to VSO's database results, RICOH media and MCC media are the most reliable DVD media, while Princo and CMC Magnetics media are the most popular. In addition to that, NEC and LG DVD burners are the most reliable and the most popular burners.