I came across a blog post elsewhere reviewing a new book about visualising statistics, Dona Wong's Wall Street Journal Guide to Information Graphics.

The review is lukewarm but the post has a lot of other links to several books about graphs, including the peerless Edward Tufte. Coincidentally I'd just been recommending to a friend Tufte's poster showing the famous Charles Joseph Minard graphic of Napoleon's doomed Russian campaign.

One book I really like is Howard Wainer's Picturing The Uncertain World. It's about both doing the statistical analysis well and presenting it in the most informative and clear way. He also wrote A Trout in the Milk.