When it comes to the MTV logo, it is very well known around the globe. After searching the different images on google, the logo almost always includes the words "Music Television" underneath it. Personally, I think it would look nice getting rid of the words and adding a speaker into the large open space on the left side of the "M" to imply that it stands for music.
The Gillette logo is pretty plain and doesn't really show what the company is trying to sell. Obviously they are well known and it has worked out for them thus far, but the idea of changing one of the "L's" into a razor or maybe putting a razor between the space inside of the "L's" seems like a pretty good idea. Although this is not all they sell, the logo will be more detailed to show the reader what types of products they are producing.
The Cannon company could make use of the space inside the "A" or the "O" by putting a camera or the lens of a camera to portray what type of product they are looking to sell. It would be better to keep it simple so it showed up the way it looks at a normal size on one of their products using smaller font.
Duracell could look to do the same type of thing as Gillette by putting a battery inside the U or replacing the "L's" with a couple batteries. They also might consider using one of their bigger batteries to represent both "L's" since they are next to each other.
