RockMelt: Web browser pioneer backs new way to surf Net
msnbc.msn.com
msnbc.msn.com
That said, I doubt it catches on inside corporations because corporations wouldn't want to encourage their employees to waste time updating their Facebook and Twitter accounts.
There are a bunch of social collaborators/aggregators coming out and this is one of the few I've seen that is a desktop app.
I think the only advantage is taking being able to cache data locally.