The New Jersey Department of Education has released the 2006 school report cards.  It includes public information about every school in New Jersey and can be used to see how well your school district is doing. 

Another helpful tool for those moving or relocating to South Jersey is provided by the Philadelphia Inquirer.  The report card database ranks each school based on the information provided by the Department of Education within PA and NJ.  It is limited to the two states and and you can research just the South Jersey schools.