I think Domain Flipping is a very good option. Its all about buying domains, restructuring them and then re-selling them at a higher price. The difference in prices will be your profit. http://www.domainsflip.com is a good guide for domain flipping.
The main difference between Domain Flipping and House Flipping is that
House Flipping involves
weeks and oftentimes months of your time to complete. House Flipping
requires working with contractors, managing teams, getting-up early and
going to the house
each day, it`s an arduous process. Domain Flipping works with your
schedule - and best of all it takes place in the comfort of your own
house flipping in your pajamas!