There's a new version of virt-manager released, it is version 0.8.2. The ebuild from 0.8.1 doesn't require any changes to be used for the new version. Tested on AMD64 and it's working. Reproducible: Always
*virt-manager-0.8.2 (22 Dec 2009) 22 Dec 2009; Diego E. Petten<C3><B2> <flameeyes@gentoo.org> +virt-manager-0.8.2.ebuild: Version bump.