Headset rattle

Park have done all the work for you..

http://www.parktool.com/repair/readhowto.asp?id=65

If it's not like this and it came from a shop this way, then you should get a new headset from them because if you've ridden it like this for a while the headset will be fucked/pitted.

What Hippy said.

Must remember pretty much everything is illustrated on parktool.