Every couple of months, RIM decides to go ahead and update their in-house developed Instant Messaging clients for BlackBerry smartphones. They never typically include any change logs with them so as the sizes of the apps continue to go, no one knows exactly what has changed.
Such is the case this time around as well. All RIM clients including Yahoo, Google Talk and Windows Live Messenger have been updated to v18.104.22.168 for those of you out there making use of them. You can grab the downloads for each below, however -- you may wish to avoid the Google Talk one as there has been reports of it not accurately showing online contacts that are available. Thanks, @Rootbrian_Download Yahoo! Messenger
Download Google Talk
Download Windows Live Messenger