I'm a big fan of Randall Monroe's web comic xkcd. I find its nerdy humour particularly amusing. Randall often employs visualization in xkcd, so I've combed through the xkcd archives and picked out some of my favourite examples.
Movie Narrative Charts
Days of the Week
Radiation Dose Chart
I've blogged about this one previously. Following the Japanese earthquake and tsunami in March 2011, Monroe published the following chart to provide some perspective on radiation doses.
And in a similar vein is this epic graphic...
Randall conducted a survey of 222,550 users (sessions) for the names they ascribed to over five million colours. From a subset of the results he built the map below showing the most popular names for the fully-saturated colours.
Three clever self-referential charts.
Some rare examples of good infographics:
Lakes and Oceans
The outlier that is grapefruit.
The remaining examples I've simply grouped by type.
Please leave a comment if I've missed any.