As reported by slashdot [1] fedora now has ksplice by default.
What about ubuntu?
I could see this [2] [3]
[1]
http://linux.slashdot.org/story/10/08/31/191228/No-More-Need-To-Reboot-Fedora-w-Ksplice
[2] http://brainstorm.ubuntu.com/idea/10069/
[3] http://brainstorm.ubuntu.com/idea/7523/
Just my two cents
Gianfranco