Hint: To stand out and increase your chances of receiving a response of “yes, we’re interested in your topic”, I recommend brainstorming creative titles. For instance, one of their posts is named as “How To Jazz Up Your Emails With Rich Media (Inspiration From Brands That Are Nailing It)” which perfectly describes my idea of using creativity in your post subject line.
The Hubspot blog is a must-read source of digital marketing news and analysis for any B2B company. Separated into 3 categories (marketing, sales, and agency) with an immense volume of insightful content, Hubspot sets the standard for inbound advertising content. If you market or sell to other businesses, add them to your RSS feed now or subscribe to receive email updates in your inbox daily, weekly, or monthly!
Mechanical Turk: Amazon's Mechanical Turk is a resource for doing human-intelligence tasks, or as the site commonly refers to them, HITs. You get paid a very small fee for any given HIT and you'll need a good deal of volume to make a substantial amount of money. But it is a resource you can use in your spare time to generate a small income online.
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.