Problem when updating using Software Update I tried to update Mac OS X using Software Update. But when I tap on software updates, it's checking software updates and listing the available updates. 

I didn't see Mac OS X update available in the list. I am not able to do this. Can you guys please help ?
What is your current OS X version ??

The latest OS X is 10.6.7 - and if you can't get it through "Software Update", then you can download the whole OS X v10.6.7 Update Combo here: http://support.apple.com/kb/DL1361