Just because there are some unlucky people here, the first and only time when I had a problem with remote updating was recently with the 2.6.9-34 kernel. After I rebooted my server it never came back online and showed me a quite nice "kernel panic". I had to boot from the previous kernel to see my server back online.
That's the first time I encounter such a problem and it is very annoying (especially because I wanted to "play" with smartd with SATA support and also because I don't like running not up to date servers).
Maybe filling a bugreport would be a good idea but I prefer to wait for the U3 to see if it fixes the bug or not.
Do you think it is safe to file a bug on RH's bugzilla ? Since CentOS is binary compatible with RHEL I assume I would have the same problem with a RHEL4 but, unfortunately, I cannot do any tests for confirming or not the problem with that distro :(.
Gilles.