It would be great to have an adventure management tool. The site as it stands can go a fair way toward managing your adventure creation, but it's not very elegant, and there are a few important factors that I believe are missing.
My idea of a good adventure management tool could:
* Store encounter descriptions
* Store hand-outs
* Allow map uploads
* Link encounters to map locations
* Link to existing wiki articles, characters, and items
* Make items visible to the players selectively. Hand-outs, maps (without encounter markers), descriptive text.
You can do something like this with the existing wiki tool, using GM-only pages. The problem is that there's no elegant way to reference your encounters, handouts, etc. If I used this site to create adventures as-is, I would soon have hundreds of pages, and my adventure pages would just be in the way for world-building, and vice-versa.
In addition, one cannot make one's maps gm-only, unless I missed a setting somewhere. So, using the map/tag feature to place your encounters would give the info away to your players.