When you are looking at the Grid view in iTunes 8, there are some not-so-obvious commands you can use to organize how your music is shown. When you are in the grid view, there is a bar at the top that allows you select between Albums, Artists, Genres, and Composers. Try right-clicking on the tab you have selected. Depending on which view you are looking at, you'll get additional options that allow you to control the display of your music. The most options are available when you are looking at your music by Album. In that case you sort using a lot of options.