1. Roll your own Google Maps overlays / plugins for navigation of large facilities. I envision a system where you take a series of GPS readings using your phone around the facility (a few on each floor). You then scan a blueprint or floor map and are able to import the structural data via OCR. Finally you roughly correlate those GPS coordinates with spots on the floor map and the software uses them and the known structural information / layout to create a Google Maps overlay.
2. A peer to peer service for facilitating sharing of paywalled scientific journal articles. You could put in a request for a specific article, the utility would check which of your friends had access to the material, your friend would be prompted to download the article and place it into a designated folder for transmission.