I'm always astonished when I see how many people have read and commented on my blog post on Lego storage. It's obviously a big problem! Several people have asked what our solution was, so here it is.
We bought a metal filing cabinet from Ikea (Helmer) and plastic dividers that fit perfectly inside each drawer (Antonius). The result is this:
This combination does a great job, but we now need another unit because my son received about a dozen Lego kits for his birthday last month (which are currently spread all over his bedroom floor).