This page has links to the 15 or so Jupiter Research Analysts who are now maintaining weblogs. I heard about this through Michael Gartenberg, Jupiter Media's Research Director for Client Access and Technologies, who gave a very interesting "hard data" talk at E-3 about game industry demographics. I'm glad to see that along with "talking the talk", he's also "walking the walk" in the blogosphere!

Jupiter Research Analyst Weblogs