I've seen ad demonstration pages on the web sites of companies
that have created some of the more annoying ad techniques. They
are intended to show webmasters what they can get if they pay
to put them on their web site. Would these be considered appropriate
links for testing?
Also, I believe only you can add new subcategories in the Links section
If you'll add subcategories for HTTP, Javascript, Java, URL, I'll
add some links for them.