This page has a list of good hard rock and heavy metal bands that are worth looking up along with links to their websites.
If there is a band that you feel should be on this list please tell me in the comments section.
SLAYER
http://www.slayer.net/
METALLICA
http://www.metallica.com/
TESTAMENT
http://www.testamentlegions.com/
MACHINE HEAD
http://www.machinehead1.com/
MESHUGGAH
http://www.meshuggah.net/
MUDVAYNE
http://www.mudvayne.com/swf/mudvayne_intro.html
NIGHTWISH
http://www.nightwish.com/
GODSMACK
http://www.godsmack.com/