The typesetting in most sites I’ve come across is decent. One example would be howstuffworks.com. Arial was a good choice, and I like the way that they integrate their color theme into the text by using blue and yellow as text header colors.
I had trouble finding an example of really bad typesetting. I don’t like it when sites use Times New Romans — it looks so cheap. Also, I noticed that some sites don’t handle font size changes very well (and the font size is very easy to change in Firefox). For example, the layout for howstuffworks.com is completely screwed up when the font size is increased by just a few sizes.
