Instan-t

Instan-t is an instant messaging client that is compatible with the most popular IM networks out there: MSN, Yahoo!, ICQ, and AOL.

In addition to basic features like sending files and video-chatting, Instan-t allows you to communicate with tons of users at the same time, thanks to chat rooms.

If you want, Instan-t will import contact lists from your various messenger accounts. You can also add contacts manually by using email addresses.

The program interface is simple and accessible, and you can even choose between different skins to find the look you like best. Instan-t has no ads or annoying pop-ups, and that fact combined with its versatility makes it a very intriguing option when you're trying to figure out how best to communicate with your friends.