This is an excellent series of 3 articles about constructing a "Sandbox" style campaign in the Supers genre. Traditionally sandbox games are done in a "Hex Crawl" style in Dungeons & Dragons or old school fantasy games more broadly, and sometimes they are done in Sci-Fi as well, such as in Traveller across sub-sector maps and so on. This series takes a look at how you can seed a city in sandbox style. I could see it being applicable to any campaigns centered on a particular urban location, super hero or not.

• Part 1: Mapping a city and determining the local trouble-makers.
• Part 2: What's going on in each neighborhood tonight?
• Part 3: Big events going on city-wide.

The articles seem to take some inspiration from "Night in Gotham", a supplement for 1st edition DC Heroes, and possibly a bit from "New York, New York", a supplement for TSR's Marvel Super Heroes Basic Set as well.