The latest mainline 3 version of the Linux kernel is:         3.3-rc2   
The latest stable 3.2 version of the Linux kernel is:         3.2.5     
The latest stable 3.1 version of the Linux kernel is:         3.1.10    
The latest stable 3.0 version of the Linux kernel is:         3.0.20    
The latest stable 2.6.33 version of the Linux kernel is:      2.6.33.20 
The latest stable 2.6.32 version of the Linux kernel is:      2.6.32.56 
The latest linux-next version of the Linux kernel is:         next-20120208