Is there a simple way to hide a layer of data points? Say
I have 5 or 6 seperate data layers showing in the legend
and I want to hide a layer.
In the old Streets and Trips I upgraded from, you had the map
points "explorer", where you could show or hide any number
of point layers and also you could drag and drop data
layers and points from set to set. I miss this ability
terribly. Is there some similar feature for mapPoint?

No, there doesn't appear
to be an easy way to do this. Maybe one of our regular contributors can
write a little add-on that helps with this. For pushpin charts, the
pushpin can be set to an invisible custom pushpin, and if there are
multiple shaded area layers, all but one can be "demoted" so the only
remaining one shows up.