Of course, Guy Kawasaki has a fabulous blog. This selection is on the top 10 lies of Entrepreneurs. Here is another of Guy's hints on The Art of Bootstrapping
Guy's Thoughts on Power Point Presentations - His more recent thoughts are at his blog.
Stanford's Entrepreneurial Education Freebies
List of 10 Ten Most Pragmatic Blogs for Entrepreneurs - Actually, your mileage may vary.
Professional Presentation Zen Blog
Entering Startup Blog (Hans Omli)