Many companies offer a low cost way to buy shares, or even parts of shares, directly from them through their Direct Stock Plans (DSP). If you want to save and invest regularly, this is the best way to do it while avoiding the excessively-high brokerage fees on small lots. These same companies will normally offer a Dividend Re-investment Program (DRIP), where dividends are not paid in cash but are instead used to buy shares or parts of shares - this allows the power of compounding to work its magic over time.
The site below seems to be a good resource for information on participating companies: http://www.dripwizard.com/home_dripsearch.asp
The site below seems to be a good resource for information on participating companies: http://www.dripwizard.com/home_dripsearch.asp