I am generally a sucker for contests so I recently did a write up for one floating around the OD&D blogs. Here is my submission to the One Page Adventure Design Contest. My submission is streamlined version of a homebrew adventure which I've had decent fun running several times in the past year. Also I'm a bit lazy in drawing new maps so that is another factor in not doing something on the spot.
As for the promotion, I like the idea for the 1-page adventures but in all honesty I find the format to be uninspired. It is a simple 'big map here' 'other crap every where else' with no formatting to speak of. I tend to be more creative with limitations so honestly things like word count, font type, strict layout would have been a favor to me.
So, what is a good 1-page adventure? The box set From the Ashes came with about 30 or so 1-page adventures that were terrific. Some I still use some to this day. Too bad the format in the contest can't really cater to this plot-heavy type of adventures. It seems like it is simply old-school for old-school sake rather than being practical.