[Update: I have verified this procedure to also work with Windows 8 Consumer Preview]
Back in September I wrote a quick guide explaining how to boot from VHD from Windows 8 Developer Preview. This turned out to be a very popular blog that attracted thousands of viewers.
Today we can expect Windows 8 Consumer Preview and although I have not yet been able to test the procedure with this build, I am pretty confident that the following guide will work as well. As soon as I have the ISO I will proof these steps and change my blog if necessary.