What's up with TV's cake-show obsession? Tonight kicks off the second season of TLC's Ultimate Cake-Off, which is yet another seven-layer look at bakers. How did cake shows join makeovers, families with 10 million kids, and ballroom dancing as a reality-TV staple subject? Is it that these shows act as prequels to the popular Biggest Loser? Whatever the reason, cake lovers have a plethora of options to choose from, so here's a handy, high-calorie guide to find the right show for you.