Thank you for this wonderful app.
I was thinking that it would be a good idea for the text inside the nodes to be handled better: alignment and for the nodes to have a max width and height and use scroll bars to fit lots of text. This way if I add a big link it does not expand the node's width by the length of the url.

I am using it to "map" the books that I write and often I have to add more text or links and the nodes become too large to properly handle. Cheers!