Interested in the latest TV on DVD reviews? DVD Talk has you covered! This week's notable entries include: Invader Zim: Operation Doom - a lot of quirky fun; Have Gun - Will Travel: The Fifth Season, Volume Two - Richard Boone's cultured, Heraclitus-quoting gunslinger returns for another half-season's worth of episodes; and Bill Moyers: World of Ideas - Writers - A valuable set of insights from some of the leading writers of our time. Other shows recently reviewed include:  Pie in the Sky: Series 4, Who Do You Think You Are? - Season 1, and Jabberjaw: The Complete Series.  Want more?  Check out all of the TV on DVD reviews in the DVDTalk database.