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learning Dutch WSL
CVO-KNVB have Dutch courses at various times of day, you go to their HQ and take a course then choose between whatever vacancies are still left for the coming term in Jan 2012. It's not far from WSL
http://www.cvo-khnb.net/new/
WSL has its own communal language school but you would probably have to wait till September.
http://www.cclm.be/
CVO Tervuren-Hoeilaart has courses in Tervuren, Kraainem, Wezembeek-Oppem and Hoeilaart. Again unless you already know a bit of Dutch, you are likely to have to wait until September to join a class.
http://www.cvoth.be/dutch.html
In WSP there is IEPS which does evening only Dutch courses.
http://users.skynet.be/ieps-woluwe/formations.html
All these options are very cheap. You can supplement these formal classes with free language or almost free converstation "tables"...
http://www.gemeenschapscentra.be/cursussen/cursusaanbod.asp
http://op-weule.vgc.be/owcm_0320.asp