The downturn has an upside: Uncov, the vicious startup blog run by Ted Dziuba and Kyle Shank, has returned to life. The twist in its new incarnation: Anyone can write for it, and the best takedowns of overfluffed ventures will be published to Uncov's homepage. We can better that offer: The best things published to Uncov's homepage may well get plucked from obscurity and featured on Valleywag.