Being pre-approved tends to help you a bit. It gives you a little leverage since they don't have to worry whether or not you will get financed. Also, if you see something of theirs you like, don't be shy about asking them to include it with the house. Normally, the longer a home has been on the market, the more willing they will be to negotiate with you.
Hey Shorts, so have you found a house to make an offer on, and just trying to get the deal done, or are you still looking for the right house?