Meebo allows you to be on all these client all at the same time. You don't have to download any software and it's free to join. Once you sign into your meebo account, it signs you on to all the IM accounts that you added to it. You can even sign on invisible if you like.
Verrrry cool!
Meebo is the GOD of IM programs. I use it daily for my windows chat, yahoo, gmail, and even facebook. It's great.
Wellington Florida
Married
My oldest uses this and loves it. I really only use Windows Live Messenger and from time to time gmail but that is rare.