I think 30 Rock keeps getting better and better. The Jack/Liz relationship is not one where two opposites spar and flirt, spar and flirt, then get together, thus destroying the show. It is not going to finish that one story arc and then be left with nowhere to go. Jack and Liz might never get together, but they do have a relationship where Liz is the buffer zone between the crazy writers and performers, and the corporate world, that keeps it all afloat. Jack sees himself in a mentor role with Liz, but sometimes the pupil teaches the master. I explore this thread further in my review of the latest episode, When it Rains, It Pours.