Just came across a new chat client today that I LOVE. It's better than Pidgin and Meebo. It's Digsby! I'm using it for AOL, MSN, Yahoo, GTalk, and ICQ accounts, it's also checking my GMail, Yahoo Mail, MSN mail, and AOL Mail accounts, AND it's keeping track of my Twitter and Facebook profiles. *whew*
Love it. They have a Windows, a Mac, and a Linux client. Go check it out.