Nfi what is up with that, right now I'm praying mine doesn't do anything like that!
If I had to start guessing I would investigate the earths, as most Wierd electrical issues are caused by earths, although with your cigarette lighter short, I would suspect you've got some melted wiring somewhere - has this car always done this, or did it start blowing the fuse recently?if so, what did you do just before that? If you have a sniff around, can you smell burnt plastic?
With regards to wiring diagrams, get a copy of elsawin, from ebay or other places, or sign up to vags Erwin site and download wiring diagrams, it's like €5 for 1 hours access.
Thanks for the info...unfortunately I actually purchased the car like this...so not quite sure what led to it.