First off, I'm a copy editor at heart - not much of an article creator, but I've received good reviews on my work enhancing the prose and research of others. Collaboration is, in my mind, the best feature of Wikipedia. Copy editing a wide variety of subjects, ranging from literature of Indian languages to Russian history and architecture, hockey, and popular culture, has allowed me the opportunity to work with a fantastic cross-section of our amazingly diverse Wikipedian editorship. They have one thing in common: they want to share well-researched and well-presented information freely with the world at large. Like me, they're hopeful hearts.
I've spent time managing vandalism and spam in Kim Kardashian, vandalism and BLP issues in Richard Gere and Richard Simmons, and assisted in the development of a factual article on the Essjay controversy (the latter of which has since undergone further revisions about which I am not entirely happy, but heck, it's a wiki). I have mild deletionist tendencies, particularly when it comes to biographical articles of people known mainly for one event. Since becoming an administrator, I've done my share of blocking obvious vandals and protecting pages.
When I have the urge to contribute, but nothing in particular that I want to work on, I generally do new page patrol—It is refreshing to see new content being added every day. In my earlier days, sometimes I just wouldn't bother logging in and would roam about the encyclopedia, reading and copy editing. I haven't done it in a while, because I was finding it frustrating to have minor revisions (spelling and grammar corrections, for example) reverted without comment or, worse yet, a warning. I have never been blocked as an IP or when logged in, nor received a credible warning.
On December 20, 2008, I was appointed to the Arbitration Committee, and much of my time on Wikipedia now is focused on the work of this committee.