Willy Tarreau has confirmed that he is no longer planning to update Linux Kernel 2.4 anymore, which means the development or maintainance phase of Linux Kernel 2.4 has been stopped completely.
Linux Kernel 2.4 was released on January 2001, which means it has been used for 11 years. On this kernel, some important features were developed, such as EXT 3, Bluetooth support, LVM, RAID, USB, ISA Card, and many more.
It was superceeded by the release of Linux Kernel 2.6, two years later. Now, after 11 years of used, i think most of the people have started to migrate to Linux Kernel 2.6 or even 3.0 which was released on July 2011.
Good bye Linux Kernel 2.4