I've always wanted a cheap GPS device with a really long battery life and adapters to plug into anything (car, usb, wall). I want to drop it in my bags (especially when I travel), keep it with me when I run, and attach it to expensive things (hidden in my car). Then have a companion website that lets user's access/download/delete and map their data. You'd have to have some plain english privacy guarantees to keep from scaring people away.

Validation and opportunity: 1. iPhone apps that track running routes successfully charge money. The gps on these things sucks and carrying it can be cumbersome. 2. OnStar and similar car systems are popular and their interactive features are being replaced by phones. 3. Suggestions?