Accessibility Documentation

Is there any user friendly documentation on creating accessible PDF files?

Some of the stuff out there is either too technical or just does not go into enough detail. I would like to get a better understand of the tags and how to apply them to complex layouts.

I almost wish there was a "Creating Web Accessible File for Dummies" type of book.

When I use the accessibility tools in Acrobat Professional (v8)/Mac or even using InDesign CS3/Mac to add tags and generate PDFs, it does not generate the desired order/results.

Thanks.