I really like how GMail matches its advertisements to the content of my email. In this case, I had just marked an email as spam:
Professional background: Entrepreneur and software developer. Veteran of seven startup companies. Worked at Microsoft and Ashton-Tate. UI design, architecture, algorithms, and hard-core implementation. (résumé)
Personal background: In my spare time, I practice photography, puzzle construction and solving, ambigrams, and way too many other things. I live in Redmond, Washington, with my wonderful wife, two kids, six computers, three Nikons, and a pizza oven.