dont know if this is still relevant to anyone but....
Zakk still uses old JCM 800's, he says he buys them used from people, they were built well back then, (plus id imagine he can get them fixed easily) they are modded though to run 6550 tubes, thats the main sound. Now he uses a marshall 4x12 with the signature speakers you can now buy on musicians friend http://www.musiciansfriend.com/product/ElectroVoice-EVM12L-Black-Labe-Speaker?sku=302002
nick cantonese (i think thats his name) the other guitarist in Black label society, uses the zakk wylde signature model marshall.. zakk does not.
obviously zakk uses gibson less pauls with emgs in them.. and if you read any interviews with him, he will yell at anyone, any producer, that tells him to try a different guitar or different amp to get a tone for a part of the song. "its an F'n les paul through an f'n marshall"
the man likes his tone.. no compromise.
oh and effects.. he used to use the boss super overdrive sd-1, but has the mxr sig pedal now. uses either a ch-3 or ch5 (something like that) boss chorus, and has the dunlop rotovibe pedal, as well now his own sig wah pedal. plus he's got some mean classical and country chops... doesn't play legato style much.