Here you will find a hack for the “crot_cron.php” script, which adds support for working with a PostgreSQL database backend.
Please give me some feedback if it is useful for you or if you have some additional changes.
crot_cron.php download.
Be aware that for now the script is working for me. Anyhow I will classify the whole thing a hack 
have fun.
I just needed to build the VMware-Tools package which is bundled with our ESXi 4 System for one of our Web-server system running the latest Ubuntu 10.10.
Vsock, VMXnet are currently broken. So I patched this modules and build a new installer package. It is running now with out problems a couple of weeks.
Download -> vmware-tools.ubuntu-10.10-2.6.35.tar.bz2
have fun