Features: Photo Sharing, PC-to-PC Calls, PC-to-Phone, Phone In, SMS, Webcam, IM Conferencing, File Transfer (2GB limit) and lot's more.

Editor: IM with friends who use Windows Live™ Messenger, Reuters Messaging, and Lotus Sametime — right from Yahoo! Messenger.

Features: Supports AIM, ICQ, MSN, Yahoo Messenger, and IRC. audio chat, file transfers, group chats, chat rooms, encrypted messaging, SMS, system-tray notifications and alerts, and privacy settings. More.

Editor: Trillian is a fully featured, stand-alone, skinnable chat client, providing capabilities not possible with original network clients.

Features: Call your friends' PC (free), video conversation, Share folders, Supports Yahoo Messenger, SMS text message, play games,

Editor: lot's better then it's predecessor, MSN Messenger

Features: Make free video calls with up to 10 friends simultaneously with SuperIM, thousands of live video chat rooms and dozens of regularly scheduled video chat shows.

Editor: IM your buddies on AIM, Yahoo and ICQ.

Features: Video backdrops, Photo Booth effects, photo slideshows, Keynote presentations, even movies on your Mac.

Editor: iChat works with AIM, the largest instant messaging community in the U.S. You and your buddies can be either AIM or .Mac users. Text, audio, and video chat whether your buddies use a Mac or a PC.