I currently find myself in the position where I need to convey the benefits of standards compliance to my team at work. This is an interesting situation, as I'm accustomed to being the lone wolf in terms of how things are implemented, but my role is being redefined as one that's more team-oriented (we'll talk about the ins and outs of this later) so in order to begin moving towards a leadership position, I need tools to help explain some esoteric concepts to people who are primarily visually-oriented.
After some searching, I found I didn't have to reinvent the wheel. The lazycat.org site adopts a postcard theme in explaining some of the benefits of standards-compliance. Check out the "Links" postcard.
The site is perfect for web standards advocacy because it employs the techniques it describes (the techniques I intend to use) and results in a site that is more than acceptable visually- it's beautiful! Click around to the other postcards- they are a quick read and do a great job explaining the benefits.
Glad you like 'em! There're a few more cards I have to put up later in the week, and some bugs to iron out, so check back later, and if you fancy writing a card or two yourself, it might end up on the site :)