In reply to Andy Torbet: I would concur with the previous replies.
I really wanst impressed with the hartz.....seemed like a bit of a misnomer to call them "Mountains", though at the time I had never heard of Ith as reported above....gonn look into that one.
I really liked Belgium: Nice crags, though a little polished in places. Luxembourg (Givet) was quite a magical place, though I have heard it is now closed to climbing.
If you are in the area, have a look at March Les Dames, Freyr, Namur and Dave (Its a place, not a bloke!).
There is a Chris Craggs guide to the Benelux areas.