When scheduling a 2nd interview . . .
Asking you to come in for a 2nd interview indicates that the company is more seriously interested in you as a candidate. At this time, ask for a copy of their Benefits Package so that you can prepare for a potential future offer. Identify 3 items that you'd like to negotiate other than vacation, salary and a signing bonus - you'll get to these later during negotiations. By identifying your wants early, you have room to deal with the offer once it is given, so that you can be more effective.