I actually heard of Opeth first on a radio show, Im pretty sure it was Godheads Lament, at that time I had no idea what the song was called.  Then I started looking around for their stuff, and I found Still Life.  Told my mate about a fab new band Ive heard of called Opeth, he went out and bought SL, I then nicked it off him and started listening to it heavily.  I went to my local and saw BWP, bought that, then found out they had earlier releases.  I got my own copy of SL, then MAYH, then M, then finally just about a month ago got the original copy of Orchid.
\m/