Good read on cycling cadence

Encouraging article for me as I TT in races around 105 rpm, but I think it's slowing dropping for me. I've recently held the mentality I need to push bigger gears, as Chrissie Wellington has talked about learning to do in recent interviews. It will get your legs strong, whereas high cadence will get your heart rate/aerobic system working more. Both good things, which is why there are times to incorporate both high and low cadence in training. This article praises Lance's high cadence:
http://www.trainright.com/articles.asp?uid=4613&p=4366