It's an oldie, but a goodie: I just watched this TED talk by Seth Godin, and feel it's worth posting here.  It's a great reminder that you don't have to be good, you just have to be remarkable.  I think this rings very true in the world of tech startups.  To be successful, your product doesn't necessarily have to be the best out there, but it does need the kind of momentum it would get from being remarkable.