Minor but useful tip. Google Books recently introduced magazines, and often I want to search for something strictly within periodicals. They allow a Content restriction in their Advanced Search. Here is a link to set this limit automatically: http://books.google.com/advanced_book_search?as_pt=MAGAZINES
Nice use of Google Earth and "sprites" to show projected plumes from major volcanoes around the world. Here is Mt. Redoubt up in Alaska, making news of late.