Yahoo recently released YM Beta 3 for download ( http://messenger.yahoo.com/mac.php )

<img src="http://img514.imageshack.us/img514/2100/picture3tl9.png" alt="Yahoo" />

-Yahoo! Messenger for Mac Beta
-Now with Voice!
-Instant message with Yahoo! and Windows Live™ Messenger* friends
-Have fun with emoticons, Avatars, and display images
-Share files, live webcam video, and more

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MAC OS x : Yet to figure out version.
CPU:AMD E-350D APU MOBO:GA-E350N RAM: 4GB 1333Mhz GPU: AMD Radeon HD 6310
HDD:Seagate 160GB SATA DVD-RW: Transcend USB Burner USB Mouse & Keyboard
WebCam: Logitech C910

Chipset:
AMD Radeon HD 6310
North Bridge: AMD A45 FCH