Here is a perfect accessory for HTPC, a wireless handheld keyboard with integrated touchpad. The keyboard utilizes 2.4GHz wireless technology that offers 30-feet range and comes with a USB receiver.
The 48-key QWERTY format handheld style keyboard features backlight for easy operation in dark. It has built-in rechargeable battery. The device measures 126 x 83 x 9mm and weighs 66g. It costs $62 USD.