I used vmware workstation when I first started using OS on virtual platform.
Later I lost touch, and I had to get back to virtualization for testing and my abandoned LinuxFromScratch project.
I was still using vmware player with vmx machines build on vmware workstation. I longed for a change and started exploring options. Here are few things that ran in my mind since 2 days..
Virtualbox needs Qt as pre-requisite; I did not want Qt on my box.
Qemu – provides Qemu accelerator – KQemu for better performance on x86!
My PC is powered by AMD’s Sempron 2400+ and I might be happy with Qemu’s
performance. What happens when I move my virtual machines to intel box? Install KQemu!
Xen – needs the host operating system kernel to run on Xen itself.
So, probably I need to boot into the xen-mydistro-kernel (like in fedora); which I am not yet
comfortable with.
Kvm – Sun product. I was a little upset with the way things went with opensolaris and sun startup
programmes; hesitant to take a look at Kvm. May be it is a great product, may be it is not.
After hours of studying documentation for virtualization software and asking for suggestions in orkut (The GNU/Linux Group), IRC channels, I zeroed on virtualbox; finally allowed Qt on my box.
Luckily I got a deb package for feisty (saved me the hassle of building from source) and thanks to dpkg for easy installation.
Life couldn’t be much easier, I thought; this did not stand for long, I discovered that I removed myself from my secondary group by using `sudo usermod -G vboxusers`.
The brighter side of it is, I used my ubuntu recovery mode (in grub) for first time; added my name in old group lines of /etc/group and I was back in business. 
Now what do I install as my new virtual OS? LFS, Zenwalk(redpill) or Mandriva2008!
