>What kind of wire should I use for prototyping on Veroboards?
>For breadboards, I use thin, single strand copper wire because
>it's stiff and it sticks into the hole easily. However,
>veroboard does not require that stiffness and the stiffness
>may actually be detrimental?

As with many answers, the answer is 'it depends ...'

If using veroboard with copper strips, then what a lot of people do is use 
insulated wire on the component side, poked through the holes, and soldered 
to the tracks. Such wire can be single or multi-strand. Many people find 
single strand is good for this, as it can be cut to length, the ends 
stripped of insulation, and then the bare ends bent at the correct spacing 
for the pair of holes that they are to go through.

Single strand wire from old telephone cabling is an ideal size for this 
purpose, thinner stuff like wire wrap wire is too thin. Wire wrap wire is 
ideal for the purpose of running patch wires when modifying PCBs, as it can 
be nicely wrapped around the pins of components.

Multistrand wire is more difficult to do this with, as it doesn't hold the 
shape well when attempting to bend it to go through the holes, and when 
soldering the strands can tend to splay out and short to other tracks. 

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