> eg
> 10-100nF
10nf seems very low for a power supply decoupling cap to me. Most PIC 
designs i've seen seem to use 100nf ceramis or polyester for the low ESR 
decoupling caps. There should also generally be a

The low ESR decoupling caps should be as close to each pair of power 
pins on the pic as reasonable (if the pic has multiple pairs of power 
pins there should generally be one per pair of power pins. When 
breadboarding I reccomend getting decoupling caps with a 0.1 inch pin 
spacing so they will sit nicely in the breadboard right next to the chip.

BTW if you ever forget a decoupling cap in a PCB design it is fairly 
easy to solder an 0603 capacitor accross two pads for a DIL chip.

 >and a small electrolytic, eg 10-100uF

Right though this is not as important as the low ESR caps mentioned above.

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