From The Official Google Blog:

Google Buzz
Last week we launched Google Buzz, a new way to start conversations about things you find interesting, like photos, videos, webpages or whatever might be on your mind. Buzz lets you share right from Gmail, or from your mobile phone. You can connect other sites you use like Twitter, Picasa, and Google Reader, and you can post buzz privately or publicly. Since we released Google Buzz, we quickly made a number of improvements based on input from users, and we’re committed to keep improving it. Individuals can use Google Buzz now, and we plan to make it available to businesses and universities using Google Apps within a few months.