Human Interface Devices (HID) Links and Businesses
(Products, services and websites vary with time. Please verify.)

To find out more about an entity's involvement with interactive television, type both their name and "interactive television" in a search engine.

Bluetooth HID
Jan Alexson Lakeview Research
Microsoft Related HID Documentation - The USB-IF's collection of Microsoft's HID documentation.
USB-IF HID Tools - The USB-IF's page devoted to human interface devices. Includes all approved documentation.

Various Related:

An Analysis of Wireless Device Implementations on USB (PDf file)
The last HID 1.11 Specification (PDF file)
Serial HID
USB Human Interface Device
Wikipedia Definition