VMC is Vallejo's original "Model Colour" line and tends to be thicker. VGC is their newer "Game Colour" line that mimics the Games Workshop paint colors. VGC Beast Brown is more or less the same as GW's Beastly Brown, a handy lightish brown that works as a nice base for flesh and buff leather among other things.
The only link I see for your blog is just a link to the company home page I think.