Ksplice has an amazing ability to apply kernel updates without rebooting.
From Wikipedia
Ksplice was an open source extension of the Linux kernel which allows system administrators to apply security patches to a running kernel without having to reboot the operating system. Ksplice has been implemented for Linux on the x86-32 and x86-64 architectures. It is currently being developed by Ksplice, Inc.
From Slashdot : Oracle Acquires K-splice For an Undisclosed Amount
"Oracle today announced it's completed the acquisition of K-Splice, dropping support for Redhat, CentOS, and SUSE, and closing doors to new customers. Unless of course you want to become a Oracle Linux Premier Support subscriber — then it comes as standard."
Oracle acquired Sun Microsystem and the Solaris Operating System an AT&T and BSD Unix blend.
They also have there own Oracle Linux, formerly known as Oracle Enterprise Linux. That is supposed to be Unbreakable and known as the "Unbreakable Enterprise Kernel"
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