Employee Benefits Links:
American Society of Pension Actuaries
BenefitsLink
401k HelpCenter

Governmental Links:
Internal Revenue Service (IRS)
Department of Labor (DOL)
Pension Benefit Guaranty Corporation (PBGC)
PBGC Search - See if they are holding pension funds for you?

Alliances:
American Funds
The Hartford
ING
John Hancock
Manulife Financial
MFS / Sun Life