Hey Lee, just perusing through the forums and noticed this thread, and the links to your error handler.
Just wanted to offer some suggestions as to making your already incredibly useful error handler, even more useful.
To keep the streamlined aspect of your webpage you could utilize the "spoiler" code, where you have to click on the word "spoiler" in order to reveal the text hidden.
But, within those you could give typical examples of what would cause the error code, and the fix to the typical example.
Sometimes when an inexperienced lisper sees an error spat back at them, and even having checked your webpage to find the description of the error and what's causing it, it can still be difficult to find out which line in specific is causing the error. A spoiler such as this may be really useful to fledglings such as myself and others, though I fear you're probably too busy for such a thing at this moment, I wanted to at least run it by you.
Have a good day!