fingerコマンドで調べられるらしい。
$ finger linux@kernel.org
The latest linux-next version of the Linux kernel is: next-20100326
The latest snapshot 2.6 version of the Linux kernel is: 2.6.34-rc2-git3
The latest mainline 2.6 version of the Linux kernel is: 2.6.34-rc2
The latest stable 2.6.33 version of the Linux kernel is: 2.6.33.1
The latest stable 2.6.32 version of the Linux kernel is: 2.6.32.10
The latest stable 2.6.31 version of the Linux kernel is: 2.6.31.12
The latest stable 2.6.30 version of the Linux kernel is: 2.6.30.10
The latest stable 2.6.27 version of the Linux kernel is: 2.6.27.45
The latest stable 2.4.37 version of the Linux kernel is: 2.4.37.9
