Colours In Cultures - there’s some neat data in here, although the graphic is quite poorly designed. Despite that, you can still pick out a few interesting points of what are semi-universal colour conventions:
I’ll Take My Infographic in Bright Orange, Men’s Medium | FlowingData - t-shirts with information graphics. One of my dozens of failed infographic ideas was to put them on t-shirts, but I didn’t get past one design (in my head).
Review: Swivel vs. Many Eyes | EagerEyes.org - Robert’s really done a comprehensive overview here; very useful. Both websites would do well to read it.
Pictures of Numbers: False Advertising - for those who seem to wonder why I care so much about my information graphics - this is what happens when you don’t care.