An alternative GUI management tool for KVM that was previously posted here just released version 0.9.5 yesterday adding drag and drop live migration for KVM.

The official changelog for the latest version is:
 

• Drag and Drop Live Migration for KVM : Similar to Xen Live migration, now you can use drag and drop to migrate KVM virtual machines without downtime. In addition you can save a running KVM virtual machine state and restore it. KVM Management is also tested against common distros like Cent OS 5.2 and Ubuntu 8.0.4.
• Storage management : This release adds support for shared storage management associated with a Server Pool. The users can declare their iSCSI, AOE and NFS shared storage and select Luns. ether disks and mount points at the time of provisioning. ConVirt gives Storage Utilization overview at Server Pool, Server or Virtual Machine level.

You can find out more about convirt here: www.convirt.net