I hate to trash anything that could lead to ratings hope for 30 Rock, but after news of Jennifer Aniston's upcoming episode, which comes complete with a Friends parody nobody needs, I'm worried 30 Rock will go the way of Will & Grace, with one wasted, stuntcasting-centric episode after another. In the past two seasons, 30 Rock has used their guest stars wisely, for the most part. Isabella Rosselini was fantastic, for example, as were Edie Falco and Emily Mortimer -- though I'm not sure she's famous enough for that to count as stuntcasting -- and I even liked the ridiculous Paul Reubens character, if not mostly for that gag about his eyebrows falling off and giving Jane Krakowski an excuse to dance every dance known to man. Jerry Seinfeld, David Schwimmer and Carrie Fisher, on the other hand, didn't work as well. I felt like the entire episode was focused not on the 30 Rock characters we tune in for, but as a platform for those guys to do their thing, regardless of what show they're on, and it appears Jennifer Aniston's episode will likely be the same. Let's hope Oprah can find a way to fit in, Edie Falco-style.