It is best to use a 0.05uF to 0.1uF capacitor near each IC, although one capacitor for every two or three ICs may suffice. In addition, a few larger tantalum capacitors (10uF, 20V is a good value) scattered throughout the circuit for energy storage is a good idea. Incidentally, bypass capacitors from power-supply lines to ground are recommended in any circuit, digital or linear. They help make the supply lines low-impedance voltage sources at high frequencies, and they prevent signal coupling between circuits via the power supply. Unbypassed power-supply lines can cause peculiar circuit behavior, oscillations, and headaches.