Agree with Gavin, allowing the user to access and export the GPS data would be very help. Linking to Google Maps would be great, but a complete solution would allow the user to copy the GPS coordinates to be used in any GPS-enabled app, such as GPS Tracks. Should require minimal development, and creates massive value.
Ideally, would see some statement from Evernote that they plan to keep GPS data and allowing users to enter it (even if Atlas is dead), so that both users and developers know that Evernote is a safe place to put data that relies on GPS coordinates. I've found "Idea Places" works very well and lets me keep using Evernote, but I'm worried that the company may not be committed to letting me continue using such a solution long term.