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(Legitimate & respectable) strategies to generate “passive income” on the Internet?
One such place where you can sell your photos is iStockPhoto.  They are pretty picky about the photos they allow, so you should be a pretty good photographer and have good equipment.  It can take a while to build up an interest in your photos, but once you do you can make some decent money off it.  My sister is a semi-pro photographer and makes about $500 a month off photos she sells there.