If your using PPC (Pay Per Click) ads to boost your web traffic and sales, check out Igor's post over at his BizMord Search and Marketing Blog. His recommendations are specific and will increase your ROI in many cases:
17 Most Common PPC Mistakes Web Marketers Make–BizMord Search and Marketing Blog
As I manage quite a few PPC campaigns I always notice the silly and sometimes not so silly mistakes that advertisers make with their PPC programs. Mistakes when creating PPC ads, click fraud detection, and lack of testing are just a few of them. Fixing each of these mistakes could mean an extra 70% of revenue or a savings of thousands of dollars every month.