Instant messaging

Meebo is an online instant messaging application. You can chat from anywhere and it even saves your message history.

eBuddy lets you login to your instant messaging accounts from the web. You can even login to MSN without creating an extra account.

IMified lets you use instant messaging to access online applications, very convenient if you want to add something quickly.

Twitter lets you send short messages to a group of friends. It is more immediate and intimate than blogging.

KoolIM is an online messaging application with all the basic features. It supports more networks than other applications.