Ask HN: Are there any HN alternative for entrepreneurs and ideas?

http://discuss.bootstrapped.fm/ is a good forum for bootstrappers (people launching products without outside investment) and http://bootstrappers.io is more Hacker News-like in its style, basically upvoted links with comments.

http://www.producthunt.com/

may or may not be what you were looking for

/r/startups

/r/entrepreneur

youngstartups.io