The Dokumentationszentrum Berliner Mauer found an elegant solution to this problem. A series of cables and thin steel poles stretch from floor to ceiling, standing as masts of sorts for the "flags" of text panels hung on them. Oversized panels were bound into booklets of which each "page" held two A4 sheets and an explanatory text. The visitor could page through the cluster, looking at each page in turn. Several cables and poles held not booklets but lightboxes with historic photographs.
The overall effect was wonderfully open — no walls necessary! — as well as highly engaging, in my experience. Rifling through the big splayed boards is incredibly tempting. Visiting the Zentrum's website just now, I see that the whole building (and probably its surrounds, which are just as much a part of the museum) is under renovation; let's hope that some of this wonderful ingenuity appears in their new design as well.