I've been a user of Ubuntu since Warty was released. My user name on ubuntuforums.org is "mostwanted".
Current goals for community participation
Participate in writing documentation, possibly artwork creation too.
I've created one fairly popular guide for Ubuntu called "How to install ANYTHING in Ubuntu!" (http://htmldesign.dk/blog3/ubuntu/installing/). I'm currently in the process of refitting this document for Ubuntu 7.10. I've also previously done some translations into Danish on launchpad, as well as submitting a few bugs.