News of Third Party VHD/VMDK Optimisation Solution

I just read an article that reports on the launch of a new third party solution (beta) by Virsto Software to optimise the performance of VHD’s on Windows Server 2008 R2 Hyper-V.  It will later be available for VMware’s VMDK’s.  It installs on the parent partition (host OS) and treats VHD’s like database files.  Instead of the VM writing directly to the VHD, it instead writes to a log file which is replayed back to the VHD.  This improves performance but also allows more VHD’s to be placed in a single LUN when I/O has become an issue (probably not channel related – more disk speed related).