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Micro Persuasion
micropersuasion.com  
Steve Rubel explores technology and its impact on marketing communications.  
marshal sandler (msandler) - "Excellent Blog Devoted to Public Relations-Social Media"

Other likes for this item:
Theresa - "A blog hosted by Steve Rubel, Edelman. Probably one of the few large PR agency execs who practice what they preach and spread the word. I've noticed that many large global agencies have been a little slow to catch onto the latest and greatest the social media gods have to offer, but Steve Rubel was microblogging, blogging, and championing open and free-flowing communications even before it was popular. One of the few RSS feeds I will follow religiously. A true gem of a blog written by a hard-core thought leader - champion of marketing, social media AND public relations." (link to entry)