After a Second Life meetup in Ghent, Belgium, a Dutch-language Belgian Second Life forum was set up:
http://slforum.be
Report of that meeting:
http://robinwauters.typepad.com/marketingblog/2007/01/second_life_dem.html
Pictures of that meeting:
http://robinwauters.typepad.com/photos/second_life_demo/
You can also join the "Belgisch SL Forum" Group in Second Life. If you do so, you get our group notice with news and updates on Belgians in Second Life (just once a week, not more!).
(Note: the north of Belgium is called Flanders, Flemish people speak Dutch like their neighbours from The Netherlands do)