Interested in the latest TV on DVD reviews? DVD Talk has you covered! This week's notable entries include: The Bill Cosby Show Season 2 - Shambling, laid-back, and sweet this show remains an underrated treasure; Poldark: Series 1 - an entertaining historical drama with plenty of romantic, melodramatic, and comedic moments to keep you coming back; and Merlin: The Complete First Season - this reworking of the King Arthur myth is not without its flaws but is also oddly addictive. Other shows recently reviewed include:  The Ruth Rendell Mysteries Collection, G.I. Joe A Real American Hero: Season Two and Dog Whisperer: Season 4, Vol. 1.  Want more?  Check out all of the TV on DVD reviews in the DVDTalk database.