How well do you recognize color? Or, to put it another way, how well do you recognize brand colors? Blue is used so much in the internet, that Colin Gourlay constructed a quiz that asks you to identify shades of blue that are associated with these internet companies. The quiz never ends, as far as I know, but it keeps a running score. Try it out yourself, but be aware that they may all start to look alike after a while. Quit while you are ahead. And don't be embarrassed that you've never heard of a lot of them -I haven't, either! -via Metafilter (which is not included has now been added)
He's adding more sites and businesses all the time... in fact, now, after a few rounds, the message "Want more than blues?" shows up at the bottom and if you click on it, you get to guess between reds, greens, oranges or purples (it's true, Yahoo isn't the only one) between the blues...