iand

Big blue header and bricks?
Your missing a } from your code:

<style type="text/css" media="screen">
body { background: url('http://zooyorkfreak.com/images/site/greybrick.jpg'); } <------add this
</style>

Your link has is url ("http://something.jpg") try replacing the double quotes with singles so you have url ('http://something.jpg') instead.

I think this has been caused in the past by incorrect line-ends set by your text editor. I can’t remember the right settings though (maybe unix?). What did you edit the file with?

Could you bin the bloginfo bit and just use
<?php echo "<img src=/images/nav_{$nav_id}.png\" width=\"120\" height=\"30\" alt=\"$nav_title\" />"; ?> I think that has the same effect but I am not too good on relative linkiness.

You use the tags as you would in a .php page i.e. <?php bloginfo('url'); ?>. Have you followed the usage instructions on the site?:
In Options -> Writing, turn off the “WordPress should correct invalidly nested XHTML automatically� option.
Write a post like normal. Save or Publish the post, then go back and edit it. Check the “eval() content� in the Discussion box and save the post again.

The API is folder specific (and doesn’t allow subfolders either), you can however include your map.html in your post/page with an iframe. There might be another way but that worked for me.

Excellent work and easy to integrate into existing styles. One question though – what is the criteria for chosing where a post with two cats goes? Does it go in to the first category listed, or both?