Here's an idea: SourceForge is connected with a great community of open source developers; Twitter is connected with a great community of individuals, some of whom are open source developers. One of the great value propositions for me for Twitter is that rather than following an open source project, I can follow the projects creators, and receive timely information about updates, patches and the like... as long as I am actually logged into a Twitter client when the update in question is pushed out. There is a lot of noise.
Yammer is great for organizational transparency, or so I've heard from people who are using it, but it's a walled garden - I wonder what would happen if a similar approach were taken with an open source repository like SourceForge? What if an open source status network like laconi.ca were hosted and synchronized with the group of individuals with SourceForge projects? Then you could follow this entire list or a segment of this list, and get updates in a timely fashion without the background noise, or aggregate this stream into the broader stream that you might normally follow.
Might inject a bit of life into the open source community as well.