There were some interesting couples on TV this week. On The Amazing Race, Ivy League partners Connor and Jonathan failed a geography lesson. Fringe, a show already teeming with evil twins, introduced us to a doppelgnger with frightening implications. Super-cousins Clark and Kara learned to fly on Smallville. Mary-Louise Parker, ahem, paired up with the artist formerly known as Zack Morris on Weeds. Tina Fey enlisted Julia Louis-Dreyfus as ...