I don't claim to know everything about grind, but some of you people have no fucking clue whatsoever.
To keep it simple.....
Napalm Death - Scum = Quintessential grindcore album. Bands in that style: Ulcerrhoea, The Kill, Rot, Excruciating Terror, Captain Cleanoff
Carcass - Reek of Putrefaction = Quintessential death metal/goregrind album. Bands in that style: The County Medical Examiners, Splatterhouse, Embalming Theatre, Pathologist
Dead Infection - Chapter of Accidents & Surgical Disembowelment = Quintessential goregrind albums. Bands in that style: Regurgitate, Vaginal Carnage, Sublime Cadaveric Decomposition, Last Days of Humanity
Gut - Odour of Torture = Quintessential porngrind album. Bands in that style: Purulent Spermcanal, Gronibard, Creamface, Rompeprop, Cock and Ball Torture
Dying Fetus - Any album = Definitely not grind.
Then there's the more recent "techgrind" style being played by bands like Pig Destroyer, AgNb, Screaming Afterbirth, Alienation Mental etc.. which is like a combo of grindcore/goregrind and tech death metal (grindcore purists will argue it's not grind at all).....there's also "cybergrind" - Libido Airbag, SMES, Microphallus etc.. - which combines techno/drum and bass with gore/porngrind......
I might be completely wrong on those, so if someone wants to correct me, please do...I'm just trying to help define it for the uninitiated.
So, go on people, check those bands out>>