LMXchange 
I'd like to announce a new service I created for you: LMXchange
It enables you to share landmarks / pois online right on your phone.
The service consists of two parts: A mobile application (the LMXchange client) and the online service.
It started as a test of using Google's Appengine as a service backend for a mobile application client. But I think the service could be useful for anyone.
For more details see
http://lmx.appspot.com
