There are numerous fantastic blogs that many brilliant engineers have created that cover vSphere and related topics. It is quite amazing the wealth of information contained in these sites.
A few of my favourites are:
Kiwi Michael Webster provides great insight and has particularly good pieces on certificate management, clustering, and storage
Especially appreciate the certification related articles. Comments on the different certification study resources and exams and the interviews with individuals holding the VCDX are great.
Good articles explaining new technologies in the storage space.
Listing of vBrownBag episodes related to each certification is a handy feature of Nick’s site.