Instant Messaging Clients Gtalk, Windows Messenger LIVE and Yahoo IM have been updated to version 126.96.36.199. No change log was available. I use MSN and Gtalk and I looked at Yahoo Messenger so I know those have received the update, The latest update should be available via your BlackBerry App World, so you can download via App World. If the update does not show for you in app world you can wait or while in App World hold ALT while hitting R S and T. This will clear the app world cache and when you re-open App World the update should show.
After install your device does require a re-boot.