Giving Stuff Away to Get More Business

I'm looking into using promotional pens for my client who wants to sell real estate web sites. We have tried brochures and flyers and they are doing good. However, why stop there when you know that a pen stays longer with a person than a flyer. I just have to be very creative in using his company logo and finding a place to insert his web site url. Another option is to have a mini-contest in his web site and give away umbrellas, mugs and USB drives to users who can refer a paying client. But we'll try the pen first and see how effective it could be before we invest more money on giveaways.