I have been thinking about writing up one of the scenarios I've run for my Wednesday night D&D group -- tentatively titled The Magonium Mine Murders -- into something usable by another GM. And it is surprisingly difficult!
It's easy to think of some things that belong in scenarios and how to organise them -- for instance, location-keyed maps are relatively easy to do (although they can be done better or worse). But when the scenario has mystery elements, it's hard to figure out what should go where. I think I ought to describe the structure of the mystery first and then that will let the reader put the clues in context, but it feels like front-loading an awful lot of plot all at once. And it also feels a little redundant with NPC descriptions and location entries in some cases.
My general inclination is to put monster and item stats in the back (or in a page that gets linked to, or whatever) but I've also seen it done very effectively with them presented in-line (Forgive Us did this very well). So I guess I'm undecided.
I think the thing to do is go to the shelves, pull out adventures that I know I liked and take a look at how they present information. If you have particular scenarios or supplements that you think were very easy to read and understand, why not recommend some for me?