Gene Quinn of IPWatchdog has painstakingly combed Technorati for the top ranked patent blogs. He personally reviewed all of the blogs to weed out those which only occasionally discussed patents. Per Gene, all the following patent blogs easily rate in the top 1% of all blogs on the Web indexed by Technorati:
Great work Gene, Thanks to you and to IPWatchdog for introducing us to a lot of great blogs.
PS – The reason there are more than 25 blogs is that Gene has been revising the list as more top Technorati ranked patent law blogs turn up. If you are aware of a patent blog that should be on the list, be sure to drop Gene a line.