After doing a lot of listening in forums, on my email list, etc... I launched http://jfdi.bz as a response to a common pain I kept seeing: there's so many people building products by themselves (alone in their basements). They want a social connection with other folks who are doing the same thing (more here: http://jfdi.bz/guide.pdf)

Did a small launch in August. It's now just over $1,000/month in revenue. I use WPEngine to host the site. It's built mostly on the open source BuddyPress platform.