I've made some contributions to Wikipedia articles. This is by no means an exhaustive list, and note that these pages may have changed beyond recognition since; I'm not keeping track. My most active period was before 2008 or so, after which time I was busy studing biology...
Akrasia - Aristotelian logic - Bivalence and related laws - Divine command theory - Doctrine of double effect - Existentialism and Humanism - Fatalism - Gettier problem - Hume's fork - Inconsistent triad - J. L. Mackie - Meditations on First Philosophy - Mere addition paradox - Modus ponendo tollens - Modus tollendo ponens - Moral skepticism - Occasionalism - Omnipotence paradox - Omniscience - Person - Peter Unger - Positive liberty - Pre-established harmony - Punishment - Reasons and Persons - Square of opposition - Suicide - The problem of Hell - Trolley problem - Virtue ethics
TV, Film, literature, and music:
Bound - Citizen X - Count Duckula - Dead Can Dance - Evanescence - Holy Wood - In a Station of the Metro - Kiefer Sutherland - Late Night Poker - The Master of Go - The Metamorphosis - The Truman Show
Politics and law:
Science and maths: