USA Payroll^® has found these web sites to be helpful.

Federal
Internal Revenue Service	www.irs.gov
Social Security Administration	www.ssa.gov
US Department of Labor	www.dol.gov
New Jersey
NJ Division of Taxation	www.state.nj.us/treasury/taxation/
NJ Department of Labor	http://lwd.dol.state.nj.us/
Pennsylvania
PA Department of Revenue	www.revenue.state.pa.us
PA Department of Labor and Industry	www.dli.state.pa.us
Delaware
DE Department of Labor	www.delawareworks.com
Philadelphia
Philadelphia	www.phila.gov