With this program you can use multiple copies of MSN Messenger at the same time.

Supports all versions of MSN Messenger including versions 7.0, 7.5 and 8.0 ( Windows Live Messenger).

MSN Messenger 7 & 8 Polygamy is easy to use: double-click MSN_Polygamy.exe to run the program, click the Patch button and then your MSN Messenger can run more than one copy simultaneously.

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talk now with your friend using Google Talk, with this free program you can call or send instant messages to your friends for free–anytime, anywhere in the world.

Features:

* Choice: Get in touch how and when you want to–over email, IM or a call
* Quality: Talk through your computer but hear your friends as if they were in the same room
* Convenience: Your Gmail contacts are pre-loaded into Google Talk so inviting or talking to your friends is just a click away

Trillian is an instant messenger which combines IRC, ICQ, AIM, YAHOO, and MSN Messangers all into one easy to use utility.
read Trillian 3.1 more

With Loudtalks you can alk to your friends or colleagues instantly with a single touch of a button. Think walkie talkie. It´s faster than text chat and more convenient than calls. Loudtalks is available for Windows right now, but we are working hard to bring it to other platforms soon, including your mobile phone.

Features:

* One to one and one to many communication
* High-quality voice
* Re-play incoming messages
* Fast and lightweight

With Gizmo Project  you can make  calls to other computers. With the click of a mouse, you’re connected to friends, family, and colleagues anywhere on earth. It’s just that simple. You talk clearly for as long as you want for free.

With inexpensive add-ons like Call In and Call Out, you can talk to any telephone–mobile or landline–on the planet.

For AOL user, here’s the latest AOL Instant Messenger for Windows  for you ( beta version )
This convenient, add-on to your system lets you communicate one-on-one or in a group with family, friends, and business associates who also use it. Finding people online can be easy too. Use the Member Directory to locate friends by name or by e-mail address.

Here’s latest update from ICQ, popular chat tool informs you who´s on-line at any time and enables you to contact them at will. No longer will you search in vain for friends & associates on the net. ICQ does the searching for you, alerting you in real time when friends & colleagues sign on. You can chat, send messages, files and URL´s, play games or use it as the perfect business tool to find and contact associates in realtime through the internet. This release includes ICQPhone which allows users to make pc-to-pc and pc-to-phone calls.
read ICQ 6.0 more

What is pidgin ?
this program is a  multi-protocol instant messaging client for Linux, BSD, MacOS X, and Windows. It is compatible with AIM (Oscar and TOC protocols), ICQ, MSN Messenger, Yahoo, IRC, Jabber, Gadu-Gadu, and Zephyr networks.

Pidgin users can log in to multiple accounts on multiple IM networks simultaneously. This means that you can be chatting with friends on AOL Instant Messenger, talking to a friend on Yahoo Messenger, and sitting in an IRC channel all at the same time.
Pidgin supports many features of the various networks, such as file transfer (coming soon), away messages, typing notification, and MSN window closing notification. It also goes beyond that and provides many unique features. A few popular features are Buddy Pounces, which give the ability to notify you, send a message, play a sound, or run a program when a specific buddy goes away, signs online, or returns from idle; and plugins, consisting of text replacement, a buddy ticker, extended message notification, iconify on away, and more.

Ventrilo is the Voice over IP (VoIP) group communications software, this software offers surround sound positioning and special sound effects on a per user, per channel, per server or global configuration level the program provides each user the option to fully customize exactly how they wish to hear sounds from other users or events.

Miranda IM is a multi protocol instant messenger client, what is the best from this chat utility is uses very little memory and requires no installation. Just unzip and run!
Also more than 350 plugins available for download that allows users to extend the functionality in Miranda IM. Plugins can be installed to add support for ICQ, AIM, MSN, Jabber, Yahoo, Gadu-Gadu, Tlen, Netsend and other protocols.