The Norwegian usability firm NetLife Research put out the 2009 edition of its annual tribute to things you shouldn't do—the Bad Usability Calendar. They've made it available free on a Creative Commons license, so you can download and print your own in English, German, Norwegian, LOLSpeak, or, if you prefer, you can translate it yourself into the language of your choice.

You might also consider buying a real calendar as well because, as you'd expect, the Bad Usability Calendar is in no way really usable.