Well, Im not sure if this have been mentioned here.
Tried to search, but didnt find anything.

I just came across this site, wich have schematics and software for a interface that lets you send your own messages to your cars lcd panel

Seems interesting, and I think i wil try to build this interface..

link:
http://sites.google.com/a/netmgr.co....W-E34-Protocol