Order nodes via drag 'n drop I'm looking for an easy way for my clients to re-arrange the order of nodes.
When creating a content type I added a "weight" field for them to change, but of course with a lot of content this is a lot of work.

Is there any module that allows drag 'n drop to change the order of nodes being displayed in a view?
I think DraggableViews is what you are looking for. Here is a quote about it (from the module's project page):

... makes rows of a view &quot;draggable&quot; which means that they can be rearranged by Drag'n'Drop.
Have you ever rearranged Blocks, sorted Taxonomy terms or reordered Menu items at the Drupal administration pages? All these pages use the tabledrag.js javascript that enables Drag'n Drop on HTML-tables.
With DraggableViews you can apply this tabledrag.js to any Views-generated table.