A single login for all your IM accounts : Imo.Im

https://imo.im/

IM your friends online

Imo is a web instant messenger that helps you IM, voice chat, and video conference using multiple instant messaging protocols.

Imo is free and requires no sign up.

A single login for all your IM accounts.

imo lets you link your accounts on aim, gmail, msn, skype, etc. When you login to a linked account, you will automatically be logged into all the accounts you have linked to it as well. This way, you only have to enter one login to access all your instant messenging accounts.

This feature requires no additional registration or sign-up. Simply login with your pre-existing usernames and passwords. Once you are logged into multiple accounts, you can link the active accounts in the session by clicking the "link accounts" button in the "Accounts" menu. A green bar will pop up at the top of the page alerting you that your accounts have been linked.

Features:

• Text and video chat with your Instant Messaging buddies from different networks.
• Supported IM netwroks: AIM, Google Talk, MSN, and Yahoo Messenger.
• Login to all IM accounts simultaneously.
• Facebook app: Text and video chat with Facebook friends.
• Surf mode : Chat and surf the web at the same time.
• Imo.im for Windows : text and video chat with AIM, Google Talk, MSN, and Yahoo contacts from desktop.
• For additional details and imo.im howto guides go here.