How do I continue plans for my business or product if I find that someone has already gotten ahead with the same idea?
I've written about this several times on my blog "Up and Running" here at Entrepreneur.com"
Ideas are Easy, Doing Stuff is Hard
Also, you'll like this one, on my Planning Startups Stories blog:
Second or third mover advantage
It's answering this same question, although it was a while ago ...