I have a hundred dollars. What could I do to turn this into an investment rather than throw it away on something?
Buy quality domain names, the shorter and pronounceable the best and preferable dot.COM's You can park them to make money and eventually sell them. Domains, when chosen properly, are cyberspace's real estate
If you have a website and if you are offering any kind of product/services, you should give AdWords a try. You can make a lot of profit given you have the right content and services on your website.
You join a domain parking site and then change your domains' nameservers to those the parking service will provide you with, or point to a landing page by redirecting as they will explain you. Then, everytime someone visit your site you are making money depending on the chosen parking program. Some pay per unique page impression, times a domain is accessed by a unique IP, but others pay per impression, click, sale or a combination of all of them. People can visit your domain either by mistake (typo names of famous domains) or if you promote your domain names, as in example, adding them to your forum signature. You can learn on domain parking services and how much they pay reading this review: www.thewebreviewer.com/domain-parking-reviews.htm
I agree that buying domains is a good idea. I am thinking about doing the same myslef. SEDO seems to be a choice I might look into. But you all may know more than me on them?
My best domain parking revenue of all times came from Domainhop, a Kanoodle's company actualy owned by DomainSponsor I have not parked domains at the moment to comment out on conversion rates, but I have tried many other parking programs including SEDO which giving me some money in return, could not be compared with the money earned through Domainhop and early through RegisterFly's domain parking service, which does not longer exist.
Yes, developing your own landing page or a fully-featured website are just two other ways to make money from your domain names