Watch online programes on my TV ?????????????

Hello,
I wonder if someone could tell me what I have to buy to be able to see online programmes on my TV in my sitting room, I am looking for something small and elegant to put next to the TV, which has a huge hard disk.I have wifi in my sitting room and I have a 32" plasma LG. At home we already have a computer and notebook, but I am looking for something to put beside my TV and be able to browse the web and watch what I want, I also want it to have a huge hard disc in order to keep all my films, documents, photo..etc. Does this exist????If so please tell me the name, brand, make, ect..... Thankyou.