64 bit support (Score 2, Informative)

Looks like 64 bit support is getting better, although Feisty Fawn isn't supported as a host OS yet. From the release notes:

New Support for 32-Bit and 64-Bit Operating Systems
This release provides experimental support for the following operating systems:
* 32-bit and 64-bit Red Hat Enterprise Linux 4.5 (Beta, formerly called 4.0 Update 5) as host and guest operating systems
* 32-bit and 64-bit SUSE Linux Enterprise Server 9 SP4 (Beta) as host and guest operating systems
* 32-bit and 64-bit Ubuntu Linux 7.04 as a guest operating system
This release provides full support for the following operating systems:

* 32-bit and 64-bit Windows Vista as host and guest operating systems
* 32-bit and 64-bit Red Hat Enterprise Linux 5.0 as host and guest operating systems
* 32-bit and 64-bit Ubuntu Linux 6.10 as host and guest operating systems
* 32-bit and 64-bit Mandriva Linux 2007 as host and guest operating systems
* 32-bit and 64-bit Solaris 10 Update 3 as guest operating system
* 32-bit Novell Netware 6.5 SP5 as guest operating system