I love charts -- a lot. Here are some of my favorite chart-related sites:
Indexed -- Pure genius. Jessica Hagy creates a daily chart on topics ranging from politics to "booze" to the Easter bunny on an index card. The observations she expresses through her charts are wry, hilarious and often poignant. It's hard to describe, and really awesome -- check it out.
Pointy Haired Dilbert -- Fabulous Excel blog, including tips about charts and all things Excel. Check out Chandoo's tips on creating sparklines in Excel. These are an easy way to communicate information (and look brilliant while doing it).
Pop Lyric Charts -- Ha! Ha.