Here's a perennial favorite - Dr. Scott Hahn. He did a series of programs with Mike Aquilina on EWTN (which are all available on the EWTN Archives, but in that silly RealAudio format) discussing his various books. These are the MP3s of one of those shows - The Lamb's Supper. This book was one of the first I read when I started getting serious about my faith -- after Karl Keating's Catholicism and Fundamentalism (an outstanding introduction to Biblical Apologetics, BTW). If you don't know much about the mass, or feel like you "just don't get anything out of it," you should give these a try.