Steve Ray tackled one of my favorite subjects on a recent Catholic Answers Live: Through the Lens of Typology (mp3). Typology "is exciting and rich. It is the Bible coming alive! Seeing it as the Apostles and Jesus did." Amen!
Steve describes the Old and New Testaments not as "old vs. new" but "foundation and fulfillment".
You can also read his comments and a summary of the questions covered on Steve's blog.