Virtualization added to kernel
Linus Torvalds officially commits virtualization component to 2.6 kernel. Kernel-based Virtual Machine for Linux (KVM) bested other solutions such as Xen and OpenVZ by officially getting included in the kernel. 
Here's what was announced:
The following patchset adds a driver for Intel's hardware virtualization
extensions to the x86 architecture. The driver adds a character device
(/dev/kvm) that exposes the virtualization capabilities to userspace. Using
this driver, a process can run a virtual machine (a "guest") in a fully
virtualized PC containing its own virtual hard disks, network adapters, and
display.
I cannot wait to test this by running 2.6 on Parallels Desktop on my MacBook Pro.