Message volume shouldn't be a problem for services like Twitter. RabbitMQ and XMPP might help to explain the solution.
Facebook has announced that Facebook Chat will support AIM as well as XMPP or Jabber support, which means that any one will be able to use almost any IM client.
Nanoblog app gets updates from open-source service via XMPP. We're still waiting for similar support from Twitter.
Redmond is killing off its Live Messenger client in favor of Skype, but the underlying Messenger service will continue to run, at least until next year.
Any programmer now can build software to tap into Windows Live Messenger's network. Perhaps in time IM will become less fragmented and more useful.
Tor's "obfsproxy" technology would make encrypted data look innocuous and let it dodge government censors. That could help citizens in Iran reach blocked sites as antigovernment protests reportedly loom.
Google is seeking to block Microsoft's new YouTube app for Windows Phone 8 because it blocks ads and allows downloading of videos from YouTube's site, in violation of its terms of service.
The cloud needs to be portable for enterprises to be comfortable using resources that they don't control.
Executive newly in charge of the company's instant-messaging work appears open to an IM standard. That could help fix fragmentation problems in the world of online chat.
The long delayed push notification technology might actually become a part of the forthcoming Mac OS X Snow Leopard.