I'd also welcome an API (REST, SOAP, etc). Functionality like the following would be great
List of your own History (finds, etc) by Date, including Lat/Lon
List of your own Caches, including Lat/Lon
List of your own Travel Bugs, including Cache ID (if in Cache) and Location by Lat/Lon (if in Cache)
List of your Travel Bugs held
Ability to list Cache's within x Km or Miles of a Lat/Lon
Detailed results for a Cache by ID
Detailed results for a Cache by ID, including Last x Logs
Non-commercial use on obviously, this is all for personal use (sharing adventures with family and/or helping with hunting). could even make it Premium Members only and use our subscription keys as the API key to track usage.