It's not a blog by a PR firm, but an interesting and irreverent blog about PR in Minnesota, and other stuff, can be found at http://www.thesamerowdycrowd.com/
Who edits these things before they go up online?
Thanks for the kind mention of the Padilla blog. While a blog can build a strong following, few blogs will reach that status. But a blog can help you to be in the right place at the right time. And the two most important places are 1) on your own Web site when prospects are checking you out (show them you're a plugged in & forward-thinking organization, and 2) in the search engines. And if you can show up in other people's blogs, all the better! 
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