Do what I do and plug in a USB keyboard to one of the 2 USB ports on the xbox 360, believe me you will be a typing god! =D
Hahaha yep yep!! Actually a lot of people didn't know they could just plug in a USB keyboard, it can be any standard edition. You can literally type a paragraph in under a minute. ULTIMATE TEXT SPAM-NO-JUTSU!
Or you could just download SmartGlass and control your xbox with your smartphone. It's simply awesome. I have it.