I wonder why they never been mentioned in the endless discussions about evolution, or did I simply miss it?

The transposons changes the image of chance and evolution as the typing monkey who produces an endless row of random letters into a picture where chance mixes whole pieces and trunks of instructions instead of letters.
Transposons - The Jumping Genes

Retrovirus and Transposons

http://www.puppenheim.org/
http://www.wuerfels-welt.de
Old Game Tutorial: http://www.puppenheim.org/MITutorial.zip
Free Game Editor: http://puppenheim.org/AlienalsWeihnachtsmann.zip
http://www.puppenheim.org/blender_starting_main_settings.txt