Wow, it's a BIG week for television-related DVD releases. Get started on your Christmas shopping early with the entire seasons of Friends, Six Feet Under or Homicide: Life on the Street. Also on DVD: season 2 of NCIS; season 4 of Lois & Clark and Reba; season 5 of Home Improvement, Northern Exposure and Quantum Leap; and season 6 of CSI, 3rd Rock From The Sun, and The Golden Girls.