Here are a few of the podcast that were new in 2015 (more to be added later):

Beyond the Shadowlands w/ Dr. Wayne Martindale

The C.S. Lewis Collection (Logos Bible Software)

Seven Literary Sages (Christian History Magazine)

The Oxford Inklings (Dr. Colin Duriez)

The Surprising Imagination of C.S. Lewis (Dr. Jerry Root)

Not Quite Lewis – Questionable Lewisian Quotations (William O’Flaherty)

Glyer and Root – CSLIS 2015 Panel Discussion (Part One)

Glyer and Root – CSLIS 2015 Panel Discussion (Part Two)

Inklings Fellowship Panel w/ Colin Duriez and others

CSL – Life, Works and Legacy pt. 1 w/ Dr. Bruce Edwards 

CSL – Life, Works and Legacy pt. 2 w/ Dr. Bruce Edwards

2013 Biographies Discussion pt. 1 w/ Charlie Starr and others 

2013 Biographies Discussion pt. 2 w/ Crystal Hurd and others

A Naked Tree/Yet One More Spring (Don King) 

Discussing Mere Christianity (Devin Brown)

Women & C.S. Lewis (Carolyn Curtis)

Joy (biography on wife of Lewis)