The Gameshark name is owned by Mad Catz. Ever since they bought it, they shut down the website and haven't made any new products. Technically still alive as Mad Catz still exists and haven't announced formal retirement of it.
I think Action Replay took up the reigns over in the console world.
Looking forward to the RC store! I like how the free t-shirt gave me 2 options - RC or the t-shirt.