Managed to slip into the Diesel jeans party last night just in time for Girl Talk's set. King of the mashup, Girl Talk (real name Gregg Gillis) sets up his laptop, invites onstage as much of the crowd as can fit and hits the "enter" key. The rest of his performance consists of tweaking his samples, whipping his head around, and enduring the overly friendly fans who just wanna get his white T-shirt off. The audience, plied with free vodka drinks, seemed evenly divided between those who wished to