I also tried "Show HN" and Betali.st for my project - sideprojectors (http://www.sideprojectors.com http://www.sideprojectors.com). They are good starting poin

I also tried "Show HN" and Betali.st for my project - sideprojectors (http://www.sideprojectors.com http://www.sideprojectors.com). They are good starting points. I think Reddit also has a sub-reddit regarding startups. As a shameless plug, would you like to post your project on SideProjectors? :) I'm doing a private beta testing at the moment with a handful of users. It's a showcase/discovery too for side projects.