There are times that I think the only reason we have cable is for GSN. We watched nearly every episode of What's My Line and got hooked on Lingo (we still miss Stacey and haven't accepted Shandi into our hearts). Now our DVR is set to record every episode of Chain Reaction.
The "Battle of the Sexes" format is odd, and occasionally the players have too much personality, but the game is fun to watch and play. And host Dylan Lane is a cutie pie.
You can play along with GSN shows while they're on the air, but I am perfectly content never watching TV shows at the time they're broadcast. WordLab (download or play online) is similar to Lingo, and I just discovered that GSN has a Shockwave version of Chain Reaction.