It seems like I've been adding a new show to the ol' TiVo lineup every night this month, but tonight really takes the cake with six major premieres, from extra-long versions of Grey's Anatomy [1] and The Office [2] to the start of ER [3]'s 15th and final season. Which of these premieres are you most excited to watch tonight?

Photos courtesy of CBS [4] and NBC [5] and copyright 2008 ABC, Inc. [6]