Top practical resource for human resource professionals. This will keep you up-to-date with the latest issues, cutting edge research, and best practices.
Resource on the laws that protect against workplace discrimination. This website is a good source for locating laws and regulations relating to workplace discrimination and proposed regulations.
OPM is the federal government's human resources department. Its "role is to provide guidance to agencies in operating human resources programs which effectively support their missions and to provide an array of personnel services to applications and employees."
The NLRB is an independent federal agency concerned with fair labor practices. This site is a good source of information on employees rights as well as the rights (and obligations) of employers and unions.