Brave Words And Bloody Knuckles -- reviews, internet radio, more. Features reknowned critics Martin Popoff and Tim Henderson. Highly recommended. Very comprehensive and intelligent.
KNAC (Former LA Heavy Metal Radio Station way back when...) -- more of the same as above. For those that remember the infamous metal station of the eighties...
BNR Metal Pages -- Incredibly large database about pretty much every metal band out there. This guy knows his shit.
Metaldisc Want metal? Buy it here. Yes, the shipping charges suck, but the selection is very good. Can the prices be better? Sure. However, as mentioned, it is tough to beat the selection and the quality of service.