1. Persuade web portal visitors to link to your web site. Give them a freebie in exchange for them linking to your web site. It could be content, software, etc.
2. Link to web sites that provide valuable information or services for your visitors. If you have many valuable links on your site, they may make it their home page, that is way to detonate your orders.
3. Spice-up your web site's wording using plenty of adjectives. It gives your visitors a clearer vision of what your explaining or describing to them, that's mean could push your orders.
4. Don't make your banner adverts look like ads. Most people ignore banner ads. Design them to look like content and have them click to read the rest.