Here is a small sample of my code.  In the line that is commented out for the AddError (used for debugging) I am asking for the ID of the newFulfillment record I just added.  How do I get the ID?

                                   List<productProcesses__c> processes = [SELECT Name, predecessorStep__c, processStep__c, successorStep__c, workStepName__c FROM productProcesses__c];
                                   //for each one add to fulfillment and fulfillmentDependencies
                                   for (productProcesses__c pp: processes) {
                                       List<fulfillment__c> newFulfillment = new List<fulfillment__c>();
                                       List<fulfillmentDependencies__c> newDependencies = new List<fulfillmentDependencies__c>();
                                       if (pp.predecessorStep__c == 0) {
                                           newStatus = 'current';
                                       } else {
                                           newStatus = 'waiting';
                                       }
                                       newFulfillment.add( new fulfillment__c (Opportunity__c = o.Id , Status__c = newStatus, workStepName__c = pp.workStepName__c));
                                       try {
                                            insert newfulfillment;
                                            //o.AddError('ID: ' + newfulfillment.Id);
                                       }
                                       catch (DmlException de) {
                                           for (Integer I = 0; I < de.getNumDml(); i++) {
                                                o.addError(de.getDmlMessage(i));
                                           }
                                       }