Hi Grooveman,
If your banners are not related to the content on your pages then you have to do a few things
1. Put the banners where they are most visible. If you look at the Yahoo home page, they put an advertising banner just under the most viewed part of the page ie where you click to access your mail.
2. Try and make your content so that your visitors stay on your page longer. The longer they are there, the greater the chances that they will at least look at your banner
3. Don't clutter the page with banners. I go for one or at most two banners on any one page
4. Text links convert better than banners or so we are told. Apparently web users have developed banner blindness,but then you could argue that big sites like Yahoo, again

, still use banners
With regards to presell I mean talking the product up without making a sales pitch.
For example if you are promoting a certain pair of nike shoes, then your page may be about the benefiits of jogging everyday or how great it is to jog till you work up a sweat or the post exercise adrenaline rush, sorry i am getting carried away. But it sounds like this is not applicable with your site