VirtualBox OSE 2.1.0 was released, bringing support for 64-bit guests. Apart from that, it adds a {{vmnet}}-style packet injection for unprivileged user via a dedicated kernel module and a whole handful of features to its closed source brother.
So why would anyone use that? VirtualBox OSE brings a high-performance full virtualization to desktops of people whose hardware doesn't support KVM. Furthermore it equips them with a mature, stable, and easy to use user interface, who is in many areas still superior to virt-manager. In other words -- it saves them from VMWare, replacing it with a lightweight and fast package which is hardly 20-th of size.
It was undoubtly a very demanded package for many Fedora users, thogh its kernel modules of questionable quality prevented it from entering Fedora. Please note that the word questionable does not necessarily mean bad, understand it as undecided, since there was no attempt to merge it with mainline kernel and therefore comply with kernel quality standards.
Fedora does not permit kernel modules built outside of mainline tree, but RPM Fusion does. And finally it seems it will leave RPM Fusion's wishlist soonish: [//bugzilla.rpmfusion.org/show_bug.cgi?id=285 A review] was already submitted and taken by Xavier (thanks to him)!
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