I’m a firm believer that one of the most effective ways to learn is to study mistakes, yours or other peoples. Which is why I used to live at Web pages that suck when first starting out in developing web content.
Just come across a similar, humoured, approach to usability in the Bad Usability Calendar. Highlights a different usability issue for each month. Which means it’s not much use as an actual calendar but very useful as a quick usability prompt.
Granted a bit late now to pick up the 2009 edition. But watch the space for the 2010 copy.