For anyone interested in using a keyboard for Xbox 360 can get the xim3 or xim4 . It is a converter that allows you to use keyboard and mouse on the Xbox 360.
Ps3 users can get the eagle eye. I have the xim3 and eagle eye. Both are good products.
There are many advantages to using a keyboard but depending on the person , some people find it difficult getting to used to a layout they like on the keyboard.
Have fun