Benefits Link - A website specializing in information for companies sponsoring employee benefit plans.

Profit Sharing 401(k) Council of America (PSCA) - PSCA is dedicated to providing useful, up-to-date information about 401(k) and profit sharing plan practices.  You can find national statistics for plan admin costs, plan returns, etc.

401(k) FAQs (PSCA) - Answers to frequently asked questions by 401(k) participants.

Employee/Employer Advisor - The U.S. Department of Labor's Pension and Welfare Benefits Administration illustrates an interactive way of providing information to both employees and employers (especially smaller companies), using an "expert system" called "elaws."

The Pension Research Council of the Wharton School of the University of Pennsylvania is an organization committed to generating debate on key policy issues affecting pensions and other employee benefits.

IRS list of allowable medical expenses - Pub 502, published by the IRS will give your employees a list of medical expenses deductible for their flexible spending cafeteria plan or individual tax return. 

Section 125 Q&A Column - Published by BenefitsLink.  An excellent quick-reference resource for cafeteria plans.

International Foundation of Employee Benefit Plans -  This foundation recommends websites and other internet resources for many benefit topics.

Associations

American Savings Education Council
American Society of Pension Actuaries
American Society for Training & Development
Canadian Pension & Benefits Institute
College & University Personnel Association
Council on Employee Benefits
Employee Assistance Professionals Association
Employee Benefit Research Institute
Employers Council on Flexible Compensation
International Association for Human Resource Information Management
International Personnel Management Association
International Society of Certified Employee Benefit Specialists
National Association of Colleges & Employers
Society for Human Resource Management
Society of Actuaries
WEB - Network

Government

FirstGov - Official website for searching all agencies of the U.S. government. Also includes links to state information for each of the 50 states.