Good luck! Our house has been on the market for several months. It's driving us nuts.
Make sure your realtor acts like she totally loves your house so that you know it will be on the top of her list to show people. Make sure he is willing to work full-time on selling your house. Make sure she cares enough about your house selling to provide you with info on the properties around it that are for sale or have just sold. Ask him what he does when houses aren't selling. Does he just say "lower the price; you should paint this room, etc." or does he say that in addition to talking about how he will change his own marketing strategy? They will all talk about sprucing up the house and lowering the price, but is the realtor also going to do something else on his/her end to try to sell it?
We pay for a large climate-controlled storage room and we've put as much extra stuff and clutter in there as we can (including family pictures). It is totally full. We work on our clutter piles regularly, but it's been very hard to have them totally gone because I have 2 small kids and we both work full time and we don't have much closet space to hide stuff. It has helped (if you can afford it) to hire someone to come and clean our house once a week, so we can concentrate on things like clutter and laundry when we're home. We bought one of those benches with storage space inside it to hide toys so there aren't any in the room where you enter the house. We LOVE that. From benches.com, which is part of hayneedle.com.
We also had the outside of our house painted. Anything "big" that is new is a plus. Out a/c was replaced less than 2 years ago, so that looks good. When we bought the house, it had a new roof, so that looked good to us. Any outdated decorations that can inexpensively updated would be good. Our realtor has suggested that we install some new ceiling fans near the entry, and she thinks that will help. If people are looking at 4 houses in your area in one day, what will make them like yours best?
Good luck! I hope you are able to sell fast. We know that part of our problem is our neighborhood, and hopefully that isn't an issue for you. We're the biggest house in our neighborhood, so it's hard to sell for a reasonable price. We got it for a steal ourselves for that very reason but it was worth it to us because it was so close to where we used to work. We're not quite willing to go that low this time, which may be the reason we're having such a hard time, coupled with a slow market.