I was just looking at the location sharing provided by Icecondor, the android app is maybe two dozen lines, if I had the foggiest idea how to write a patch or plugin for an existing mapping app or as a standalone I would.
The location sharing was a useful feature that I miss from my OpenMoko, unfortunately the server is no longer available even if the app were ported.
Icecondor is a FOSS project which is also available for Android phones making it more useful than just sharing between the rare Maemo/Meego device.
http://github.com/icecondor
http://icecondor.com/dashboard/developers

Often we are without Internet especially when traveling where a prepaid local voice/SMS SIM card is purchased at a corner shop. Sending a standardized SMS with GPS information is very useful in this case, this app is already on OVI for the N9. The relevant code could be recycled for a new multi use or an existing app in addition to just being modified and recompiled for Fremantle.
https://gitorious.org/location2sms

Ideally location sharing would work as an optional plugin for an app or perhaps even telepathy.

Is anyone else interested in location sharing as a way to find friends with a mapping app as opposed to having visitors try to explain landmarks over the telephone? I know that I would find this as important and useful upgrade and return of dropped feature as host mode.
Apparently location sharing was supposed to be part of of the N900 telepathy and OVI Maps but was cut before release http://vimeo.com/14631858
What do you think?