As a lifelong Mac user, it pains me to say this, but Bill Gates' new Web site, the Gates Notes, is excellent. He's retired from being actively involved in Microsoft, but is now working full time as co-chair of the Bill & Melinda Gates Foundation. He created the Gates Notes site to share his thoughts on both his work with the foundation and on other things he's learning about and interested in. It's a great opportunity to get a peek inside the mind of one of the world's most successful people.
One article on the site I found particularly interesting was a piece he did answering the question "Where can I get unbiased news?" He sites some great sources, and it's well worth checking out.
Bill Gates also joined the ranks of Twitter just last week, where he's offering a wide range of thoughts, links, and retweets.