Today's Internet is dominated by Networking sites.

While Facebook, orkut, myspace are able to get many eyeballs, the people who are making money are the ones who were able to provide some add on applications to those networking sites. However, these sites help you to make friends and then leverage contacts to your business advantage.

For more serious people linkedin dot comis a good place to be in.

Also sites like alibaba dot com enable you to register and sell your products or identify the products that you can buy at lowe r cost and sell at higher costs.

Keep your eyes and ears open and leverage your contacts!