A useful blog listings site
Why? Simply because of its focus on British blogs. For a journalist looking to get the blogosphere's feelings on a current issue, or just expertise on a British issue, it can be difficult to escape the fact that most blogs are American. Britblog allows you to search by keyword as well as location, so if you're looking for political blog in Birmingham, you can (sadly at the moment you can't cross-reference the two in a search but have to go through the list of either). The UK map (which represents each blogger with a clickable dot) is also a nice touch.