An Ebay store would be an easy way to make a little cash on the side. One of my friends kid makes 300-500 per week selling kids clothes (she is only 14 years old). Buys clearance rack clothes and then resells them on ebay. Lists once a week, ships once a week. I believe the post office will even pick up your boxes at your house.

Another of my friends shops bulk auctions and resells them on ebay as single items. ex. buys 5-10 laptops on ubid.com and resells them individually on ebay. Not sure how it is working for him, but it is a possibility.

Google adsense if you have an operating web page. I have seen a little income off of this program. You must have a web page, but this is fairly easy, with all of the templates available. I know one person that made almost 10k last year off of this program. Just create a web page that is exciting, interesting to you. Ideas for pilots - international restaurants, how to travel, secrets of the industry, safety of traveling, customs, and etc.