SupportGuidelines.com
From the site: "SupportGuidelines.com is the comprehensive resource for the interpretation and application of child support guidelines in the United States. It is designed to be an aid primarily for attorneys who wish to research the law of child support in general and child support guidelines in particular."
Other Resources
Here are some links to helpful pamphlets and other resources.
Handbook On Child Support Enforcement
The Child Support Enforcement (CSE) Program, a federal/state/local partnership to collect child support, provides a nice, online handbook.
WantedPosters.com's Hall Of Shame
Post information about a deadbeat parent here. Provide a tip, if you have one, to help find a deadbeat parent. Check to see if someone is an alleged deadbeat here.