CloneVDIGUI… the alternative to VirtualBox vboxmanage clonehd command

Virtualbox forum user "mpack" has created another great tool which provides the following features:

• Reads VDI,VHD,VMDK or RAW, writes VDI.
• A simple GUI Interface.
• A CLI interface too (for people who like that kind of thing!)
• Ability to discard unused blocks from the clone (no need to run SDelete/zerofree first).
• Ability to enlarge the maximum size of a virtual disk.
• User choice to either keep the old UUID or generate a new one for the clone.
• Some useful diagnostics about the source VDI, such as the partition map and the internal fileystem.
• Better feedback while cloning: a progress bar and an estimated time to completion.
• It seems to be significantly faster than "VBoxManage clonehd".
• Open source.

Link to latest version of the tool: http://forums.virtualbox.org/download/file.php?id=4671
Link to the forum: http://forums.virtualbox.org/viewtopic.php?f=6&t=22422

If you still want to use VboxManage clonehd (which works great), here is a great tutorial:
http://www.modhul.com/2009/06/17/how-to-clone-or-copy-a-virtualbox-virtual-disk/