O.K. for anyone who wants the recipe...first let me say that it's more trial and error than anything else. But, the basic configuration goes something like this:
1 perfectly ripe to slightly overripe avocado
evaporated milk (about 1/8 cup)
coconut milk (a splash)
ice ('til the blender is about 3/4 full)
If you like things sweet, add a tsp of sugar (however the evaporated milk should do the trick)
Now, make one and enjoy - I promise you won't get it right the first couple of times, but you WILL be addicted!