text: get GAIM (on PC) or Adium (on MAC).\n\nThey let you sign-in to all the various accounts, so you can be online at the same time on yahoo, gtalk, msnmessenger, aol-iM, etc. all thru just one chat-software.\n\nSkype is also great. It lets you talk like on the phone for free, but you can also pay and call ppl on their normal phones. It's better than yahoo coz you can speak simultaneously (at the same time) like on the phone rather than only one person at a time.