Hi,
(2) Sprinkle capacitors across power and ground all over your circuit. Preferably as close to the power and ground pins of each chip as possible. Usually they're 0.1uf (100nf) ceramic capacitors. Some big chips require you to use several near them, so read you datasheets. Chips are fast. Very fast. They can either generate very brief short circuits (in the ballpark of 10nS), and/or be susceptible to these very short glitches on the power rails.
I cannot stress enough how much pain this will spare you. I recently built a combined volt- and amperemeter with a 2x16 LCD readout on a rather small pcb, and I did point-to-point-wiring like I always do, and it did not want to work. Some weird oscillations at the volts ADC. The first thing I did was inserting a 100nF cap next to every (!) IC, and bam, problem solved.
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