Some random pics of the ludicrously excessive heat sink I'm using to keep the EasyDriver's main IC cool can be seen below...
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Eagle-eyed readers will notice that the heat sink is from the graphics card of a 1st generation XBox360 (one that perished among countless thousands of its brethren in the Red Ring of Death catastrophe. It served me well in life, now may it do so in death.
To be honest, this is complete overkill but it does also provide a nice surface I can screw other things to in order to affix everything to my camera tripod.
Heat sinking of some sort is definitely required though, that chip you can see pressed hard against the heat sink does get very hot indeed. Hot enough to elicit blasphemous utterances from those incautious enough to let a stray finger brush past its surface when the heat sink is not attached. With the sink on there, the temperature of that IC package merely hovers around the 45 celcius mark while on my workbench. Given that this unit will be deployed in the cool air of the witching hour outside in autumnal months, heat is no longer a problem. :)