Quoted from Axl:links dead? I only get 500 - Internal server error.
Those two links look like they're temporary links used while editing a Sitebuilder website, rather than the final links to the actual site.
Working-at-the-moment links:
47 Things You Need To Know: http://psaux.com/pinball/tims-47-list.pdf
Make Your Pinball Peppy: http://psaux.com/pinball/tims-peppy-doc.pdf