Lists identifying top patent blogs are woefully out of date, as many of the blogs listed have been completely abandoned by their authors.

Juristat has compiled a list of our favorite patent blogs which are continually updated and relevant to the practice and academic study of patent law.

Patently-O
The most widely read patent blog. Updated often, covering a wide range of patent topics. Authored by Professor Dennis Crouch of the University of Missouri School of Law and Professor Jason Rantanen of the University of Iowa College of Law.

PatentDocs  
Discussion of patent issues focusing on the biotechnology and pharmaceutical industries.  Authored by Dr. Donald Zuhn and Dr. Kevin Noonan of McDonnell Boehnen Hulbert & Berghoff.

PharmaPatents  
PharmaPatents is an online resource for up-to-date information to help you get the most out of your patent budget and meet the challenges of maximizing the value of your intellectual property in the chemical, biotech, and pharmaceutical fields.  Authored by Courtenay Brinckerhoff of Foley & Lardner.

Essential Patent Blog  
David Long of Kelley Drye & Warren.

FOSS Patents  
Software patents news and issues w/ a focus on wireless & mobile devices.  Authored by Florian Mueller, intellectual property-activist-turned-analyst.

Anticipate This  
Anticipate This!™ (AT!) is a patent and trademark law blog providing thought-provoking commentary . . . with a dash of irreverent humor.  Authored by Jacob Ward of Fraser, Clemens, Martin & Miller.

IPWatchdog  
Focused on the business, policy and substance of patents and other forms of intellectual property, such as copyrights and trademarks. Unlike many blogs, we strive to provide information and detailed analysis with magazine length articles and op-ed pieces.  Authored by Gene Quinn of Zies, Widerman & Malek.

Hal Wegner's E-Newsletters
Though not a blog, I have enjoyed the legendary Hal Wegner's views on relevant issues in patent law through his E-Newsletter, which he often sends out multiple times a day.  In order to sign up, simply email Hal and ask to be added to his list of newsletter recipients.  Authored by Hal Wegner of Foley & Lardner.

Director's Forum, A Blog From USPTO's Leadership
 Patent issues relevant to the USPTO.  Authored by USPTO leadership.

AIA Blog (USPTO)  
This blog provides updates and information about various AIA related issues.  Authored by the USPTO.

Patents4Life  
Blog focusing on biotechnology issues in patent law.  Authored by Warren D. Woessner of Schwegman Lundberg Woessner.

Green Patent Blog  
Covering intellectual property issues in clean technology.  Authored by Eric Lane of Green Patent Law.

The Patent Prospector - Panning the Patent Stream  
The Patent Prospector provides news, information, opinion, and sassy entertainment about all aspects of patents.  Edited by Gary Odom of Patent Hawk.

Orange Book Blog  
Covering the intersection between Patent and FDA Law.  Edited by Dr. Aaron F. Barkoff of McAndrews, Held & Malloy.

IP News.Flash  
IP Newsflash is an IP meta-information portal that browses your information channels for you and presents only relevant, recent and customizable IP information on a single page.  Edited by Rolf Claessen of Freischem.