Oracle’s VirtualBox 4.0.8 is now available for download. This is just a maintenance release. It improves stability and fixes regressions. VirtualBox is a powerful x86 and AMD64/Intel64 virtualization product for enterprise as well as home use.
Some fixes are
incompatibility with recent Mac OS X versions in 64-bit mode
potential crash during shutdown
removed assumption that string descriptors are null-terminated
added support for X.Org Server 1.10
VirtualBox Homepage
