NJ has an amnesty program in place that also expires soon -- June 15, 2009 to be exact1. This from CCH:
The amnesty applies only to state tax liabilities for tax returns due on and after January 1, 2002 (the day following termination of the most recent amnesty period), and before February 1, 2009. During the amnesty period, a taxpayer who has failed to pay a state tax can pay the tax and one-half of the balance of interest that is due as of May 1, 2009, without the imposition of the remaining one-half of the balance of interest that is due as of that date, recovery fees, and civil or criminal penalties arising out of the tax obligation. The amnesty is not be available to a taxpayer who, at the time of payment, is under criminal investigation or charge for any state tax matter.
If a taxpayer eligible for the amnesty fails during the amnesty period to pay taxes owed, that taxpayer will be subject to a 5% penalty that may not be waived or abated2. The 5% penalty will be in addition to all other penalties, interest, or collection costs otherwise authorized by law.