No different systems on kernel.org! Download the latest - linux-2.6.14.
2.6.14-git4 - newer but less stable, it is created automatically based upon
2.4 kernels are of a great stability but only valuable for the considerable
servers. Not all programs can work properly under old kernels. But migrating
from 2.4 to 2.6 is alittle complex and almost impossible on a big servers, so
this thread is also supported. Also I can repeat it is of a great stabillity.
The same story with 2.2 and 2.0 kernels. It is a bad idea to download one of
these kernels for desktop. Choose 2.6 for now.
Also there people who develop kernel. You can test there work using -ac or -mm
kernel versions. In common it is useful for people interested in kernel
E.g. Linus can investigate these kernels and change the main
thread appropriate if he like.
Hope you understood what I said regardless to my English
and it helps.
And the best sollution is to choose the latest stable linux-2.6.14.