Ok, now my mouse has stopped responding completely, which was I must say rather unexpected, I hoped it would survive till tomorrow :(

MSN is cool - it sits harmlessly in systray until someone decides to tell me something. Then this window pops up and starts flashing. Can there be anything cooler than that? :) So it's non-annoying, because it sits in systray and doesn't affect you in any ways if you're busy but at the same time if someone decides to talk to you, you can't miss it :) And there's always "block" button :)