The Twitter logo represents the the "tweet", like a bird. It is a simple image but known well; it related back to the name and the idea of a tweet.
The NBC logo has the peacock that represents the station being one of the first in color. This is a clever way to show the beauty of color, like how a peacock has beautiful color.
The Droid logo also represents the brand well because the idea of the phone is that it can do all these things, like a robot. We are becoming more technological and the robot represents that.
The Amazon logo is a works well because not only does it state the website within its logo but the arrow also represents a few things. The orange arrow represents a smile, like it is leaving the customer happy; as well as and arrow pointing from A to Z representing that they have everything from A to Z. The simplicity of the two colors works because the orange arrow stands out more with the black text.
The Volkswagen logo is simple and with the logo being blue and white it is clear to see the V and the W within the logo; obviously representing the name VolksWagen.
These images do a great job and relaying the message of what their company is all about and also, with most, incorporating the name into the logo.
