Multi-vendor marketplaces, like ThemeForest, can be very successful. Chose a niche and create a vendor website for it. Your marketplace could be anything, from a platform for local artists to sell their work on, to an online digital product store. Once set up, invite people in that industry to sell their products on your site. You take a percentage of their profits when items sell.
Lending Club (U.S. Residents Only) – I’ve been talking about this site ever since I started this blog, so there’s no reason to stop now.  Lending Club is an important part of my passive income strategy.  I discuss it in all of my income reports, so you can read those for more detail.  As I’ve said several times, I believe this is my only true source of passive income.

I’ve been lurking in your blog for 3 hours now instead of working — though I still consider this productive. ha! Thank you for these ideas. I’ve read a lot of “how-to-earn-from-your-blog” blogs and this one is definitely up there. I wanted to try the amazon niche sites challenge — would definitely give it a thought and will use your link when I decide to actually do it. I’ll visit some of the links from this post now. ;p

eBay is the most popular global auction site around and is a great place to sell items you no longer want. If you are looking to earn some extra cash, start out by looking around your house for things you no longer want; list them on eBay and watch as customers bid on them. You can also purchase clearance sale items and thrift store finds and make a couple dollars profit by listing them as well. The key to selling on eBay is to do your research and find out what the hot items are.