Let points $A = (0 ,0 ,0)$, $B = (1, 0, 0)$, $C = (0, 2, 0)$, and $D = (0, 0, 3)$. Points $E$, $F$, $G$, and $H$ are midpoints of line segments $\overline{BD},$ $\overline{AB},$ $\overline {AC},$ and $\overline{DC}$ respectively.  Find the area of quadrilateral $EFGH$.
Since $E$ is the midpoint of $\overline{BD},$ and $F$ is the midpoint of $\overline{AB},$ $\overline{EF}$ is parallel to $\overline{AD},$ and $EF = \frac{AD}{2}.$  Similarly, $\overline{GH}$ is parallel to $\overline{AD},$ and $GH = \frac{AD}{2}.$  Since $AD = 3,$ $EF = GH = \frac{3}{2}.$

[asy]
unitsize(1 cm);

pair A, B, C, D, E, F, G, H;

A = (0,0);
B = (3,0);
C = 2*dir(220);
D = (0,3);
E = (B + D)/2;
F = (A + B)/2;
G = (A + C)/2;
H = (C + D)/2;

draw(A--B,dashed);
draw(A--C,dashed);
draw(A--D,dashed);
draw(B--C--D--cycle);
draw(E--F--G--H--cycle);

label("$A$", A, NE);
label("$B$", B, dir(0));
label("$C$", C, SW);
label("$D$", D, N);
label("$E$", E, NE);
label("$F$", F, NE);
label("$G$", G, W);
label("$H$", H, W);
[/asy]

Likewise, $\overline{FG}$ and $\overline{EH}$ are parallel to $\overline{BC},$ and $FG = EH = \frac{BC}{2} = \frac{\sqrt{5}}{2}.$  Since $\overline{AD}$ and $\overline{BC}$ are perpendicular, $EFGH$ is a rectangle.  Therefore,
\[[EFGH] = \frac{3}{2} \cdot \frac{\sqrt{5}}{2} = \boxed{\frac{3 \sqrt{5}}{4}}.\]