Currently I am working towards the VMware VCIX6-DCV certification.  To prepare for this I am going through the vBrownBag videos on the VCP6-DCV certification.  It is a good deep dive that covers a lot of things you may have missed or forgotten over time.  It has helped me improve things in day job that I was not doing properly.   If you are working towards an VMWare certification or just trying to learn more. I really recommended going through the videos that they have put together.  They have also covered teh VCP6-NV and VCP6-CMA.  Hopefully soon they will cover the VCP6-DTM.