Into isometries of $C_0(X,E)$'s
  Suppose $X$ and $Y$ are locally compact Hausdorff spaces, $E$ and $F$ are Banach spaces and $F$ is strictly convex. We show that every linear isometry $T$ from $C_0(X,E)$ {\em into} $C_0(Y,F)$ is essentially a weighted composition operator $Tf(y) = h(y) (f(\varphi(y)))$. This supplements results of Jerison (when $T$ is onto) and Cambern (when $X,Y$ are compact). 
Jyh-Shyang Jeang, Ngai-Ching Wong