Well, it has happened and it wasn't the end of the world as many predicted. Last year, the first keyboard & mouse adapter for the Xbox was released and there was no impact on the community for the use of that hardware.
The Link Depot USB 2.0 to PS/2 Keyboard and Mouse Adapter offers simple plug and play operation for your computer or laptop. It allows you to link PS/2 compatible hardware to the USB port on your computer or notebook. This PS/2 cable adapter supports the standard Windows multimedia keys.
A while ago, i bought these two Mayflash Max Shooter converters for $59.85 each because they were the only promising PS2 -> Xbox360 converters on the market. I've used them exactly once. I needed to plug two digital PS1 pads into my Xbox360. That didn't work and i couldn't return them so i've had them since.
I received a XIM Edge(Mouse and keyboard adapters available for the Xbox 360 and Playstation 3.) I order it when I am not habitual with the console and now it is a pain(I cannot make it work.