The newest version of the Google Drive API should help developers more easily add Drive to their own apps. Google says the improved API is more consistent and simpler for first-time developers. Drive within apps can be used for file storage in addition to creating and editing files.
Shoudio is an amusing iOS application made to tag places with audio snippets. These can be anything a user imagines, and a lot of fun could be had with this. For example, integrating this into Geocaching could be a lot of fun, allowing things like audio hints to help Geocachers find the cache. However, the developers of Shoudio didn't want it limited to just one platform, so they released a Shoudio API to allow clients for other platforms, and fun mashups.