Perception is based on our core senses: sight, smell, taste, touch, and sound. If you want to create a lasting image, you have to cater specifically to those senses. People do not know anymore than what they are told or what they have already experienced.
Lately we have been doing quite a bit of research and development for bigger corporations that require a very clean and extremely user friendly way to present all of their content (which in some cases is quite overwhelming, to say the least) online.
After many, many hours of research I have personally come to a conclusion that most of the corporate websites suck and the ones that don't are very few and far in between.
Without further ado, my list of top corporate websites: