Calculate $(.\overline{6})(3)$.
Let $x=.\overline{6}$. Multiplying both sides by 10, we get $10x=6.\overline{6}$. Subtracting these equations yields $9x=6$, so $x=\frac{6}{9}=\frac{2}{3}$. Substituting this into our original expression, we get \[(.\overline{6})(3)=\left( \frac{2}{3} \right) (3) = \left( \frac{2}{\cancel{3}} \right) (\cancel{3}) = \boxed{2}.\]