Pet Peeve

I have recently been going through my iTunes catalog and reorganizing it so that things show up properly and I noticed that in my many moves I had several copies of some items in different places on my hard drive.  I have over 100GB of catalog so this is going to be a goal for 2008 to get it all looking good.  I have also started an excel file to library my DVD and book collection.  I am a nerd.  My pet peeve is that when I upload books on CD to iTunes, the different discs sometimes have different tags.  Because of this fact I have to look through my iPod when listening when it is time to change discs.  One of my John Maxwell books has the tracks listed in Indian instead of English.  So I am working through this.  What are some of your pet peeves and how frustrated do you get with them?