I agree with what Lanefan said - especially a single map printed separately - and instead of marking monster starting points the map could have reference numbers and letters printed on its sides, and the module could indicate starting points by grid references. This would also make it easier to track invisible monsters, hidden pits etc.It would be cool to start seeing suggestions (and I mean actual suggestions) on a layout replacement for the delve format from those who dislike it.
The stat blocks being all on a single page is good, but again this can be done in a separate booklet from the discussion of tactics etc.
What I don't like about the Delve format is (i) it chews up too much space, and (ii) it makes it hard for me to retrieve the information I want (eg NPC motivations, treasure information, lighting details etc are too often buried somewhere in the encounter description when I need them to referee the exploration that the players are engaging in).
It also encourages authors to write their encounters in a "closed" rather than "open" fashion, which in turn encourages producing modules that are railroads, and have silly narrow plots that support the railroad. This, in turn, contributes (in my view) to the perception of 4e as a "skirmish game" or "dice rolling exercise". The delve format discourages an approach to scenario or encounter design that sees the GM's job as crafting and adjudicating a situation that is responsive to the concerns of the players, rathter than dictating of their concerns.