Google is reknown for launching brilliant services, offering it free to use with little if not any monetization model at all on the service, in then move on politely to kill the next big thing. They did this with mail with the launch of their GMail service, with Picasa, the photo management software and site, GTalk, the IM and VOIP service, etc. Disruptive technologies with high impact viral marketing from the geek world with their blogs, Twitter accounts and other sharing platforms work for Google.
Their latest offering is a stab at content sharing and uses GMail as a platform to house the technology and fuses the concepts of Google Wave, Twitter and GMail into a seamless inteface that is usable, easy to understand and practical.
The biggest advantage that it has to other services, is that all Google products use the same consolidated Contacts list. Google Buzz looks to integrate Twitter, Picasa, Flickr, YouTube, etc.
Here is a video released by Google to highlight the concept of Google Buzz:
GMail has really grown up since its launch as it now hosts mail, IM, docs, and now Buzz. Best of all, it’s available for mobile too!