AngryBirds-Score.com, it's more than 2000 users worldwide :
http://angrybirds-score.com/stats.php

We have created an Android App to upload scores (it has to evolve) :
https://market.android.com/details?id=com.abscores.app

If you are able to create a Symbian App (or other platform) to synchronize scores on http://angrybirds-score.com, we can be partners !