Here's a quick project I've been working, for my own use, shared here for others who may be interested. It's a basic map editor for Inform 7.
It lets you visually layout your maps, then exports the Inform code (which is basically English), for use in the Inform editor.
<img src="http://dl.dropbox.com/u/41325628/construct2/inform-map-editor/inform-map-editor-screenshot.jpg" border="0">
It's very basically currently and may have some bugs, though I'm providing the capx here so others can edit it if needed.
Try it out here: TRY IT
And the capx:
I think it could come in handy for anyone looking to create a basic map editor. The size of the grid is very easy to adjust, it's purely based on the dimensions of the Tile object. It'll calculate the number of rows/columns based on the layout dimensions.
I've since realized a far more elegant way to achieve this one so I'll be working toward that rather than continuing this one, methinks.