This writeup on Typography Type Tips from Harry Roberts is a must-read for anyone dabbling in the world of web design. Aside from the fact that many of the tips are just good insights into the written English language (i.e. em dash vs en dash vs hypen) it also provides solid tips on making sites more readable and friendlier to users eyes. I will say I am guilty of using Guillemets incorrectly and feel properly chided for it.

via Will Jardine.