As far as potential profit goes, one of the best ways of making money on the internet is by writing an e-book.

There are two approaches – one is to find a really profitable topic (like making money on the internet) and the other is to find a niche market.

Most of the most profitable markets are pretty crowded already. But if you can manage to get noticed there are always buyers for this type of product.

As for niche marketing, that can be a much easier market to break into. The trick is finding a market that has enough interested potential buyers but not so many that everyone else is trying to sell to them as well.

Do your market research with Google Keywords and other free tools out there. Find your topic and have at-it.