By the binomial theorem, \[\begin{aligned} \left(\frac12-x\right)^{2001}& = (-x)^{2001} + \binom{2001}{1} \left(\frac{1}{2}\right) (-x)^{2000} + \binom{2001}{2} \left(\frac{1}{2}\right)^2 (-x)^{1999} + \dotsb \\ &= - x^{2001} + \frac{2001}{2} x^{2000} - \frac{2001 \cdot 2000}{8} x^{1999} + \dotsb.\end{aligned}\]Thus, \[x^{2001} + \left(\frac{1}{2}-x\right)^{2001} = \frac{2001}{2}x^{2000} - \frac{2001 \cdot 2000}{8} x^{1999} + \dotsb.\](Note that the $ x^{2001} $ terms canceled!) Then by Vieta's formulas, the sum of the roots is \[-\frac{-2001 \cdot 2000/8}{2001/2} = \boxed{500}.\] Another approach is to replace $ x $ with $ \frac{1}{4}-y $, making the equation $ \left(\frac{1}{4}-y\right)^{2001}+\left(\frac{1}{4}+y\right)^{2001}=0 $. Because the left-hand side is symmetric with respect to $ y $ and $ -y $, any solution to the equation pairs off with another solution to have a sum of $ 0 $. Since $ x^{2001} $ pairs off with a term of $ -x^{2001} $ from the expansion of the second term in the original equation, this is a degree-$ 2000 $ polynomial equation in disguise, so the sum of its roots is $ 2000\cdot\frac{1}{4}-0=500 $.