Dreambox Directory Structure

Sorry that I haven't explored the whole tree, but here are the three most important ones:

Where to put plugins?

DM7000 var/tuxbox/plugins
DM7020 usr/lib/tuxbox/plugins

simply copy the .so and .cfg files there and they'll automatially appear in the Plugins menu, which can be accessed with the blue button.

Where are the important enigma files (services,bouquets,config)?

DM7000 var/tuxbox/config/enigma
DM7020 etc/enigma

Where is satellite.xml

DM7000 var/etc
DM7020 etc/tuxbox

software versions before 1.07 had other directories

Radiovibrations.com -> Dreambox Notes