The Word Detective. Fascinating, for those who love language.
http://www.dreaded-apostrophe.com/. As a professional writer, I need to point it out.
Pi Approximation Day (22/7)(those Swedes!)
http://www.angelfire.com/al2/LatvianStuff/Latvia.html. This site has many links (some expired, unfortunately) to things Latvian: food, culture, history, news. It's worth exploring.
Nicole Hollander's web site (creator of Sylvia cartoon, my favorite).