Upgrade MySQL from 5.0 to 5.1 (no replies)

Hi

what is the best way to upgrade binary installed mysql server from 5.0 to 5.1 without reloading the running DBs to minimize the downtime??

my case is, I have mysql-server 5.0 binary installed on RHEL 5 (and Centos 5) using mysql RedHat version. I want to upgrade to mysql-server 5.1 but RH repo does not provide mysql 5.1 yet.

I downloaded mysql server packages from mysql.com but I could not do "rpm -Uvh" on mysql.com packages and got some errors and seems rpm system deals with them as a different packages and refuse to upgrade the already installed RH mysql packages.

thanks!