I love the idea behind FFG's Modular Encounters - short, simple add-on adventures that can be dropped into a campaign to give it some variation - and have played around with making a few of my own. I haven't made anything I've done accessible to others, mostly because I haven't polished anything into what I would consider publishable quality, but I'm looking into doing just that and throwing them into a Dropbox or Google Drive for easy access. I've got maybe three or four already typed out, but I'd really like to have a larger variety.
To that end, I'd love to hear your suggestions. What would you like to see in a modular encounter?