Rewrite the equation to get $$\sqrt{x+\sqrt{4x+\sqrt{16x+\sqrt{\ldots+\sqrt{4^{2008}x+3}}}}}=\sqrt{x}+1$$ Squaring both sides yields $$\sqrt{4x+\sqrt{\ldots+\sqrt{4^{2008}x+3}}}=2\sqrt{x}+1$$ Squaring again yields $$\sqrt{16x+\sqrt{\ldots+\sqrt{4^{2008}x+3}}}=4\sqrt{x}+1$$ One can see that by continuing this process one gets $$\sqrt{4^{2008}x+3}=2^{2008}\sqrt{x}+1$$ so that $2 \cdot 2^{2008} \sqrt{x}=2$. Hence $x=4^{-2008}$. It is also easy to check that this is indeed a solution to the original equation.