These have been around for years and I belive they originally came with an internet tv device. They have to be configured using Girder and a ir reciever. They are ok, but most people I know opted to not use them and just use a regular type keyboard.
IR makes it kind of a pain to use and drains batteries quickly if you type a lot. They can be found on ebay. I think MP3CAR used to sell them in the store.