Working with JOSM I recently stumbled often on orphaned nodes scattered in the Data Layers (which I downloaded from OSM). These are often located near or on streets (which sometimes are mapped) and have no tags.

Example: http://enjoys.it/stuff/OSM_orphandots.png

What should I do with those, delete them?

After some hassle with JOSM and generic understandings I have now started to work on it.