i'm always polite to people, i've helped someone out picking stuff up before, after they've dropped it.
i hold doors open for people, sometimes let people in front of me in a queue at a store (usually if they're female...i'm not sexist in anyway btw..)
when i'm driving i'm considerate, but i still think all people over 70 should STOP DRIVING!!! or at least drive NEAR the speed limit which is NOT 10mph..

all in all i'd say i do at least 1 good deed per day =]