One prime example, The Office. Cast members Steve Carrell (Michael), BJ Novak (Ryan), Mindy Kaling (Kelly), and Paul Lieberstein (Toby) are all WGA members also, and will not cross the picket line.
AICN has reports from a whole bunch of other shows where cast/writers/producers won't be showing up for work.
http://www.aintitcool.com/node/34700
Shows listed so far:
The Office
30 Rock
New Adventures of Old Christine
Battlestar Galactica
Terminator
Rules of Engagement
Desperate Housewives
CSI
Pushing Daisies
Lost
Heroes
Grey's Anatomy
Private Practice
The Unit
The Shield
More will likely be listed as reports come in.
A depressing notion that I heard of, that will happen during the WGA strike, is that TV networks are going to go heavy on reality and game shows until the strike ends. FOX is supposed to be the best off because of American Idol.
I hate reality shows...
This is gonna suck. 

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