Gojira - French progressive death metal band, just got the new album The Way of All Flesh and enjoying a lot.

Metallica - Death Magnetic is probably the best thing they've done in 20 years.
Nevermore
Rammstein
Lamb of God
Mastodon
Suffocation
Testament (especially Low and The Gathering)
Meshuggah - Obzen is comeback for this band
Death
Sadus
Chimaira - Resurrection was probably my favorite album of 2007

Also: Maiden, Priest, Megadeth, Carcass, Tool, Lacrimosa just to add a few more.