There was one thing I was looking forward to this week more than anything. (Yes, even more than being just two scripts away from reading every single drama pilot this development season, which feels pretty damn good.) That thing was, of course, the return of original episodes of brilliant comedy 30 Rock to the airwaves. I felt very worried as the familiar musical strains began last night's episode ("MILF Island"); would the episode live up to my high expectations after all of this time or would I be disappointed after I built up this moment for so many months now? I'm happy to see that the answer to the latter question is a resounding NO. I thought that "MILF Island" was textbook 30 Rock : slick, sly, and filled to the brim with throwaway lines, ongoing jokes, and surreal, brainy humor. What other series would offer up such a deliciously apt send up of slipping NBC quality standards with the meta show-within-a-show MILF Island ? The return of an in-joke at