stable:2.6.32.7 from kernel.org is really stable?
 

Last stable kernel I see in kernel.org is 2.6.32.7
is this kernel really stable? It is not disadvantage to compile your own kernel from kernel.org?
I say disadvantage, because if you have the original kernel in Lenny for example: 2.6.26
you will update it every time there are updates available on Debian repos.
What about these kernels in kernel.org?

I had always thought that there were no issues with the kernel.org kernels until very recently. It's not that they're unstable. In fact, they are probably better kernels than what your distro has; at the very least, they have updates for security and drivers. The issue is one of compatibility. For instance, if you switch to a kernel somewhere past 2.6.28 (don't know exactly which one) you will need to modify /etc/init.d/nfs-kernel-server, as the check for nfsd has changed. I was also getting a random screen freeze up to about 2.6.32.3. Earlier kernel issues included such things as a change to the config strings for SATA drives.

So, if you have a sufficient level of competence (and time), then go for the kernel.org kernels and have the latest stuff. OTOH, if you are unable or don't have the time to track down things like the nfs-kernel-server script problem, then it's better to stay with what's provided by your distro. Most users will probably want to stay with the distro kernel.

How can I update a kernel from kernel.org?
My current kernel that cames with debian, I think is update because I have debian repos, is that right?
And how can I update kernel that I compiled from kernel.org?