Moreover u can create a meebo ID, so just type ur user-ID & password once n log into all ur fav messenger.
So if at office your are not allowed to use messenger, then try this web based one.
For publishers, there is a thing called WIDGET that u can directly paste on to ur site code so u can talk to ur site visitors directly!!! U can see live example of this... jus check-out my sites lower-right corner!
As meebo is web-based it is 100% platform independent!!! At the time of writing this, it does not support following browsers:
IE 7.0 Beta & Beta 2 and Opera 8.53