I am an avid reader of Mark Cuban's blog -
http://www.blogmaverick.com. He does a phenomenal job with pointing out certain business situations.
Not only that, his blog has links to other blogs on Google, RSS, Apple, etc. A lot of good info in these blogs, from people who really look into the details (at least I think so). Check it out, and if you stumble across any good ones, information, etc - post it here.
Some of the interesting blogs listed:
Google Blog (Unofficial) -
http://google.weblogsinc.com/
Microsoft Blog (Unofficial) -
http://microsoft.weblogsinc.com/
Apple Blog (Unofficial) -
http://apple.weblogsinc.com/
RSS Blog -
http://rss.weblogsinc.com/