Body of Knowledge

In order to check the latest kernel version available just do this:

$ finger @kernel.org

And get an output similar to:

[kernel.org]
The latest stable version of the Linux kernel is:           2.6.22.4
The latest prepatch for the stable Linux kernel tree is:    2.6.23-rc3
The latest snapshot for the stable Linux kernel tree is:    2.6.23-rc3-git4
The latest 2.4 version of the Linux kernel is:              2.4.35.1
The latest 2.2 version of the Linux kernel is:              2.2.26
The latest prepatch for the 2.2 Linux kernel tree is:       2.2.27-rc2
The latest -mm patch to the stable Linux kernels is:        2.6.23-rc2-mm2