I see it every single day...

Really bad websites with no clear sales message or organization trying to sell information or products to the masses.  The owners of these sites spend all of their time in the forums talking about how it's impossible to sell online, or how internet marketing doesn't work, or even how the economy is so bad that everyone has stopped spending money.  They're blaming their lack of sales and revenue on everything but themselves and their terrible sales technique.

The answer to the lackluster sales experienced by these sites is to immediately convert over to a direct response type of site.  If you're not familiar with this method, take a look at this site - it's an excellent example of what you should be doing.  Notice that there are no distractions, no ads, no links out of the site except for the order link and a newsletter subscription form.  Carefully study this site and model your own product sales sites after it for maximum revenue.