I've been wrestling with this and I thought I would put it out there and gauge some opinions.
At 360|Flex I presented a session directed at application (Flex) developers aimed to inspire them to improve their application design skills. It was part inspirational and part instructional as I went through basic design principles they should be aware of.
I've been asked to give a follow up presentation at <a href="http://www.flashandthecity.com">Flash and the City</a> and as I've been preparing I've been tempted to include examples of good and bad design in applications. I don't really like the idea of present bad examples; I don't think studying the negative always produces positive results, but at the same time there are some bad UIs out there and they may not know what constitutes a poor design.