Take a look at, for example. apple.com and nike.com. These are two extremely sucessful companies that on their webpages displays their logos but no necessarily their name. That is, when going to apple.com, the name "Apple" isn't displayed anywhere. The same thing goes for nike.com (although the contens of the submenus are a different matter).
Now, is there any theory behind this choice? Are people distracted if both the name and the logo are shown?