[CentOS] VirtualBox on CentOS 6.0?

I have an older quad-core AMD processor that supports hardware virtualization on a motherboard that does not support it in the bios.

Eventually I'll swap the mobo out on this box for one that will support hardware virtualization and use qemu-kvm. I prefer kvm because of SELinux and sVirt that protects the host from VM breakout should a VM become hostile.

In the meantime, I want to start work on a web project and want to use this idle machine and CentOS 6.0 in a VM. What I prototype and learn will eventually be moved to the production machine using kvm and sVirt.

So...I downloaded and installed Virtualbox 4.x but haven't yet had the time to check it out.

Any tips/tricks concerning it?

Dave