Love this flickr set of Mid-Century Modern logos designed in the 60s, particularly the letterform logos. So simple, and now so retro looking compared to flashy modern corporate logos, but they remind you how much personality can be conveyed in a letterform.
They also reminded me of the San Francisco MUNI logo that I spend a considerable amount of time looking at as the buses and trolley drive around town. I love that SF has stayed with this logo, which was designed in the mid-70s by a Bay Area graphic designer.
via Aqua Velvet
(Their designers and the companies they represented can be found on the flickr site.)