What do you do for passive income?

Happy new year! Wow, I've been gone for so long. Haven't posted here since Jan 2011 and it's Jan 2013 now! Could it be that I get a zest for blogging at the beginning of the year and then it fades? Talk about things that make you go "hmmm".

Anyway, I would love to hear from people who earn passive and residual income. What are you doing? How did you get started? How much effort do you have to put into it? Let's get the conversation going, so that we make our dreams come true.