Disgorge's old stuff (Cranial Impalement, She Lay Gutted)
and all the Devourment have some really sick death metal vocals, mostly gutteral growls and gurgles
there's a couple more bands like Goratory, Cock And Ball Torture, Cuntgrinder, I hate the band Despised Icon, but their first cd (Consumed by your poison) had some kickass growls and pig squels, not to mention one of the singers was a girl!!!)
for just really brutal vocals check out:
Decrepit Birth
Suffocation
Gorguts
Angelcorpse
Debauchery
Deeds Of Flesh
Immolation
Vital Remains
Pan-Thy-Monium have some sick vocals that don't mean anything, they pulled an Obituary!
for black metal stuff Burzum Xasthur and Leviathan, Xasthur's vocals are fucking sick
-Fuzzy