sentences:  Previous regular presenters were Matthew Revell (Seasons 1 - 4), Adrian Bradshaw (Seasons 2 - 4) and Stephen Parkes (Season 1, and first few shows of Season 2).The show has also featured a number of guest presenters.Guests have included Ximian co-founder Nat Friedman, Google Open Source program manager Chris DiBona, Sun Head of Open Source Strategy Simon Phipps and Eric Raymond among others.