The Dilbert Blog
I don't know how I missed its introduction, but I have always found Scott Adams to be an intelligent, entertaining read, and he absolutely will not let anyone get away with sloppy logic. In these times, that's something to be treasured. If you haven't read his books, do. They're so much more than just cartoons (not that there's anything wrong with cartoons--I love cartoons).
And the hundreds of comments on his posts are almost always a discussion worth reading. Just a great find, altogether. Enjoy.