Hi,

For nodes you could make their height large enough to fit both image and text, set ImageAlign to TopCenter, and TextFormat.LineAlignment to Far (that's .NET code on server, otherwise call node.setLineAlignment() on client).

You could also move labels below nodes with some custom drawing in JavaScript:

node.onUpdateVisuals = onUpdateVisuals;
node.invalidate();

function onUpdateVisuals(node)
{
	var bounds = node.getBounds();
	node.text.y = bounds.bottom();
	node.text.lineAlignment = Alignment.Near;
} 

There is no way to specify link labels position at this time without custom drawing, but we'll release version supporting multiple labels per link in JavaScript in a couple of weeks (they are already available in our .NET libraries), and they can be placed at custom positions or auto-arranged to avoid overlapping.

I hope that helps,
Stoyan