Shared map data between gps softwares

I'm currently travelling a lot (more than 6 months long) and I used GPS from iphone or bluetooth/usb receiver. Sadly, I used a lot of differents software to handle my gpx/maps and every one of them has its own set of map data which makes a big waste of space and time.
In my case, I use Gmapcatcher to fetch maps for offline use / search them (~/.googlemaps, tile format), gpsprune to check my gpx (but only openstreetmap)(no cache by default, user-configureable path, seems to be tile format), foxtrotgps to check against different map provider (~/Maps, tile), sometimes would have wanted to import whole openstreetmap planet.bin (http://planet.openstreetmap.org/) or maybe interact with other map software but no easy way (tried navit which has its own binary format, also gpxviewer).
Even if it is tile format for many, I'm not sure directories hierarchy is the same.

Please have an option to use a common repository/format for all these software so all could use the same data at the same time. (and it's valid for desktop AND smartphone too)

Thanks

http://code.google.com/p/gmapcatcher/issues/detail?id=301
https://sourceforge.net/tracker/?func=detail&aid=3466768&group_id=192994&atid=943644