The Inside AdWords blog has posted that you can now customise the columns in your account.
“Are there certain statistics in your account that you don’t need to see each time you log in? Now, you can use our Customizable Columns feature to choose the columns you’d like to view. Simply select the new ‘Customize Columns’ link from the Campaign Summary, Campaign Detail, and/or Ad Group Detail page, and indicate which column you’d like to hide. The column selected will immediately stop showing and will remain hidden until you choose to unhide it.”