The most amazing opportunity on the Internet right now is with blogging.  The way you can make money with blogging is by relating an experience or an opinion you have on a particular topic in a way that is compelling for others to read.  Then when you start getting traffic to your site, you simply place ads on the site.  There are services out there that are even free.  The tools out there are getting easier and easier to use and have more marketing intelligence than you might think.  The best tool as has been stated before is Moguling.com.  Check out my other blog here at work from home blogs.