My friend and I both have <a href="http://www.expertvillage.com/video/24538_concept-bikers-headset-one.htm">threadless headsets (the stem clamps around the steer tube)</a>, so these are all about threadless:


<ul>
<li><a href="http://fruita.peterbeers.net/Bicycle_Repair/Headset_Adjust/Headset.htm">adjusting the tightness</a> (<a href="http://www.expertvillage.com/video/24537_concept-bikers-headset-adjust-two.htm">great video</a>, <a href="http://www.expertvillage.com/video/37335_bicycle-repair-threadless-headset.htm">great video2</a>, <a href="http://www.youtube.com/watch?v=RRFqU07u8DE">video2</a>, <a href="http://www.youtube.com/watch?v=ZsjZx9Kg7ng">video3</a>)
<li><a href="http://www.expertvillage.com/video/71271_bike-repair-remove-threadless.htm">goddamn, bing bang boom, it's all apart</a>
<li><a href="http://www.expertvillage.com/video/24540_concept-bikers-stem.htm">flip your stem over</a>