There's a terrific new way to create graphs in your web pages: the Google Chart API. Using their API, it is very, very easy to create great looking pie charts, line, bar, and scatter graphs as well as Venn diagrams. The nice thing about their API (aside from the fact that it's so well documented and easy to use), is that the result of your link to it is a PNG graphics image; you don't have to mess around with CSS to good the graphs.