If you’re thinking of taking on a project, don’t be discouraged just because someone has already taken a stab at it, or even if the market appears to be saturated with competing products. “So-and-so already did that” is probably the worst reason not to make a product. The maxim of “best-to-market trumps first-to-market” has been demonstrated repeatedly by Apple, and if you are really good, your take on things will stand out from the rest of the crowd.