Actually, they're not. As far as I can tell, Uggs are here to stay, even with their faint air of Kate Hudson circa "I'm so in love with my hubby" about them. But... how did the damn things get to be so popular? (I have my own theories about the little shoe-puffs — they are the equivalent of giving your feet a really high dose of euphoria.) Today, we're deciphering trends. How do you know when something has really caught on? 100 calorie packs, Uggs, Wii, the i-Phone (oh yeah, we fell for that one)... how do you know that trapeze dresses are so 2007, and it's time to get a pencil skirt? We'll talk to trendwatchers/spotters, but we want to hear from you. What have you watched/spotted/bought/loved/hated/cut holes in/patched up again?