Seven is also known as Arnulf Christl. I am a professional user of OSM data in several projects. The most interesting one is probably PRTR, the Germany "Pollution Release and Transfer Registry". It has some interesting challenges wrt copyright and licensing, read more in my Blog on Copyright in a Shrapnel Shell.
I have several thousand km of roads including tracks of the interior of Peru with logs and notes sitting on my box and I have no time] to upload and process them.