Hot answers tagged startup
Try the StackExchange OnStartups site, or TheFunded (registration and clearance required).
Hacker News: http://news.ycombinator.com is one.
StartUps are a particular subject strenth on Quora too it seems.
I had a quick look around and came across this - http://programmermeetdesigner.com/ - which looks kind of similar.
Only top voted, non community-wiki answers of a minimum length are eligible