I have installed gajim, notification-daemon, libnotify.notification-daemon launched by ~/.xprofile line "/usr/lib/notification-daemon-1.0/notification-daemon &""notify-send" console command works and displays notifications in top-right corner. But gajim uses it's built-in notifications in bottom-right corner.
My Favorite Chat Messenger in Windows already reach version 10.0.0.1258. This version has new design and layout. Yahoo Messenger is free to download and use. Yahoo! Messenger 10 includes many updates and capability upgrade like better PC to PC calls or PC to Phone calls, nice emoticons, avatars.