I was on the Chicago Tribune website, and the top banner ad contained the following picture links to a site promoting penny stocks. The link went to a site with those annoying pop-up ads that are difficult to destroy. I think a good investing rule, or at least guideline, is to not buy stocks promoted at websites with half-naked women. Another might be to avoid investments that present +1000% returns as examples (see here or here), which are often common on these sites. As mentioned, average penny stock returns are pretty dismal, the ultimate lottery stocks.