Sepultribe- The mother of all Sepultura sites.
Sepultura.com.br- The cornerstone of Sepultura online.
Sepulman's Choke Site- One of the last remaining "independant" Sepultura sites out there. If you are looking for Sep pics, then this site is all you'll need.
Soulfly Web- Arguably the best Soulfly site left.
The Pimp Rock Palace- Easily the best news resource for metal/hardcore/etc. on the internet.
Roadrunner Records- Record company of Soulfly and formerly of Sepultura.