I regularly read BNR metal pages, so I heard about Opeth from there. I downloaded Bleak from Kazaa back in 2002 to check them out, along with several other bands. That song blew me away, thought it was the greatest metal I had ever heard. I went out and bought all of their CDs I could find. I now think Opeth is the greatest metal band on earth, and I have been listening to metal for 30 years.
Other outstanding bands I have been turned on to via BNR are Virgin Black, Unexpect, Sigh, and Hollenthon.