Ksplice - Install updates without Rebooting

Ksplice Uptrack and discover how you can:

1. Keep your systems up to date and secure, without rebooting.
2. Save time by updating in seconds, while your systems are running.
3. Avoid disruptive downtime.
4. Prevent costly security incidents by patching in a timely manner.

It is free for Ubuntu 9.04 and 9.10. For more technical details on how ksplice works, you can take a look at
ksplice technical paper