Many IC's I've seen suggest decoupling capacitors across Vdd to Vss - this is sensible.
However some IC's for example the dsPIC33FJ128GP802 has THREE Vss pins and only two Vdd pins (AVdd and Vdd.) So would I put a decoupling capacitor on each Vdd pin, or from each Vdd pin to each Vss pin?
Answer
I believe the general rule is 1 cap per Vdd pin.
Are you using a ground plane? If so, don't bother attaching the caps to Vss pins. However, if you are using a ground bus instead, then yeah you should attach the cathode of the caps directly to Vss.
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