Letters

Sometimes brand name and logo are so strong you can recognize the brand just by having a look at one single letter using their standard font... here is the "company" alphabet... guess who is who

Interesting quality links

While browsing, I found a few interesting sites about poka yoke (mistake proofing) and bad designs.

This one is about badly designed user interfaces, or systems:
http://www.baddesigns.com/

This one is a very nice mistake proofing site with a lot of useful information:
http://www.mistakeproofing.com/example1.html

Specifically about software mistake proofing
http://www.mistakeproofing.com/software.html

and the famous hotdog sawstop example:
the video
http://www.sawstop.com/
how it is designed
http://www.sawstop.com/how-it-works-overview.htm

Turkish traffic lights

TU3_2482, originally uploaded by gugs.

an interesting concept: the number of remaining seconds is being displayed on traffic lights, red or green, you exactly know when the lights will change...