I've installed VirtualBox on my SSD (X25-M), and have installed Windows 7 x32 within the VM. The host is Windows 7 x32.
All recommended optimizations are implemented on the host.
On the VM, I've disabled defrag, disabled Superfetch. VM is running MS' built-in AHCI controller.
Performance is poor - about as good as the VM performed when installed on a standard HD.
Anything special I need to do with a VM mounted on an SSD?