Realizing Your Idea Isn't Original
webwright: Write a list of all of the companies/products that you admire.  How many of them attacked a new market or idea?  Ipod? Google Search?  Google Adwords?  WordPress?  Facebook?  Microsoft?  Starbucks?  Walmart?  Ebay?  Craigslist?  YouTube?  HackerNews (!)?  None were the first to try what they eventually succeeded at.Seriously, unless the other folks are literally owning the market, keep chasing it.  Most markets have plenty of room for multiple successful players.