Virtualization is obviously becoming a better and better documented topic.
Over at UbuntuGeek.com is a fresh HOWTO on installing VirtualBox 1.6 in ad Ubuntu 8.04 Hardy Heron setup, including USB Support.
Over at the other side of the Linux Distribution Spectrum, Falko Timme at How to Forge documents how to install and use OpenVZ on Centos 5.2.
So if you don’t feel like playing outside this weekend, you know what to do 
Kris Buytaert is a long time Linux and Open Source Consultant active in Belgium , Europe and the rest of the universe. He is currently working for Inuits Kris is the Co-Author of Virtualization with Xen ,used to be the maintainer of the openMosix HOWTO and author of different technical publications. He is frequently speaking at, or organizing different international conferences He spends most of his time working on Linux Clustering (both High Availability, Scalability and HPC), Virtualisation and Large Infrastructure Management projects hence trying to build infrastructures that can survive the 10th floor test, better known today as the cloud while actively promoting the devops idea ! His blog titled "Everything is a Freaking DNS Problem" can be found at http://www.krisbuytaert.be/blog/