I've used VMWARE ESX / Xen paravirtualization, Virtuozzo, Solaris Containers, and FreeBSD Jails as os level virtualization. Virutalbox is another full virtualization solution. Presently, VirtualBox runs on Windows, Linux and Macintosh hosts and supports a large number of guest operating systems including but not limited to Windows (NT 4.0, 2000, XP, Server 2003, Vista), DOS/Windows 3.x, Linux (2.4 and 2.6), and OpenBSD.
Rakesh has published a small article about VirtualBox Virtualization software. Both Windows and Linux can be run together simultaneously, and you don't even need to switch between the two. With the seamless Windows feature of the latest version of VirtualBox virtualization software, you can seamlesssly run both Windows and Linux applications from the same desktop interface. This has been made possible by the combined efforts of VirtualBox and SeamlessRDP that is meant for seamless Windows support for rdesktop.
=> How to run Windows and Linux at one place? [ciol.com]
This is an interesting review on PC-BSD and to be honest it looks like a decent alternative to desktop Linux.
I’ve already written about Linux vs FreeBSD on server with lots of interesting commentary from both FreeBSD and Linux
fan boys users. I'm using Linux desktop since 1999 and I will never go back to Windows. Many of my friends and coworkers owns Mac OS X but I don't have any plan to jump into it either. However Dru Lavigne offers another alternative PC-BSD ~ the other open source Unix descendant:
Ubuntu is known as Linux for Human Beings, because it's driven by the philosophy that "software should be available free of charge, software tools should be usable by people in their local language and despite any disabilities, and people should have the freedom to customize and alter their software in whatever way they see fit" (Ubuntu Documentation).
PC-BSD, on the other hand, "has been designed with the casual computer user in mind. Installing the system is simply a matter of a few clicks and a few minutes for the installation process to finish. Hardware such as video, sound, network, and other devices will be auto-detected and available at the first system startup. Home users will immediately feel comfortable with PC-BSD's desktop interface, with KDE 3.5 running under the hood. Software installation has also been designed to be as painless as possible, simply double-click and software will be installed...
=> Linux vs. BSD, What's the Difference? [linuxdevcenter.com]
There's an old saying that goes, if it's not broken, don't fix it! My main concern is hardware compatibility especially wireless card. What do you think? Are you going for a test drive?