it would be lovley to have such a feature. as I simply hate the big square popping up all the time when contacts are signing in. and if you turn it off, you don't notice when friends do login
(without using the great feature of "display on desktop" on contacts...). What would be nice would just be a small popup above the tray, just where the normal alerts come, but just minimal window and L: NICK (for logins) and M: NICK for messages. or something like that....hope you understand...