I usually do my IMing via MSN Messenger. I like it because it is popular among people I know, and it has lots of features. My wife has access to a different computer now, and she downloaded the new MSN Messenger 7.0. (I didn't even know that it was upgraded.) Once I saw what she could do, I rushed to download it on my own computer.
The new MSN Messenger allows for: handwritten text, personalized emoticons, moving graphics (called "winks"), a buzzer (called "nudge"), a personal weblog with photo storage capabilities, and a bunch of other stuff that I haven't discovered yet.
If you're still using an older version of MSN Messenger, I'd recommend that you "bite the bullet" and download the updated version. (It takes slightly less than a half-hour on dialup.) There is more fun stuff for you and your friends to enjoy.