Which are your favourite (Windows/Linux) instant messaging clients?

For examples, AIM, Triton, Yahoo, MSN, Windows Messenger, Trillian, Gaim, Miranda, Skype etc.

For a long list, refer to Category:Free instant messaging clients - Wikipedia, the free encyclopedia

i got ym, msn, skype and gtalk.... out of all i only run ym coz it got online radio to listen too..... the rest are only run at the request of my customers....

I got YM n MSN, I like MSN more, coz I got more frens there

i use pigdin (formerly gaim) as i run on linux/unix. it can run almost all IM services. the sad things is.. i cant BUZZ people in YM! huhuhuhu

I have Ubuntu and XP dual boot on my laptop, for windows.. I use Messenger and Skype, for Gnome, Pidgin i think is the best choice. (there is a skype for linux version, I tried it in another distro which can run smoothly, however I haven't install it to my Ubuntu)

curently im using skype and MSN for my window...but i like to use skype for calling...smooth and better than MSN...

Pidgin is my favorite one.