1. HogwartsProfessor.com. A very erudite blog run by Professor John Granger, who is so knowledgeable, hard-working, and good-hearted that he is undoubtedly a distant relative of Hermione Granger. Be sure to check out the blogroll too for more excellent Potter sites, especially the excellent Sword of Gryffindor.
2. The Anchoress. Musings on life, ethics (and sometimes current events) from an intelligent Roman Catholic perspective.