Alex Santoso's Neatorama has an interesting post on The Evolution of Tech Companies' Logos. It's not a big list, but it does include Adobe, Apple, IBM, Nokia and Xerox. In the comments, someone points to the Kodak logo's progress, or regress. And Kodak is a tech company....
Incidentally, if we're talking logos, the IBM one is best seen as a blue square with the letters reversed out. As is well known, it was designed by Paul Rand, who also did the logos for ABC, Westinghouse, UPS, NeXT and others.
