I've been charged with thinking about improving pedestrian access at a major regional shopping area - a large 4-anchor mall surrounded by, within about a 1 mile radius, numerous "big box" centers, including both Target and K-Mart, Sam's Club and Wal-Mart and BJ's, Best Buy, etc. You get the idea, there's probably one of these not too far from you.
The ideas that I've come across are basically to create attractive and comfortable, easy-to-spot walkways that connect stores within a single shopping center, connect the various buildings within a single property, and connect buildings to transit stops, which are ideally located close (no more than a few hundred feet) to building entrances.
Any great ideas that have worked well? I especially like the idea of landscaped islands separating parking aisles as a traffic-calming device, so that cars won't cut through diagonally (and where possible the walkways could extend down these).