I listen to my music mostly on my ipod which doesn't get added to my tracks i've listened to.
Also I don't like it how you have to listen to a track all the way through for it to register as 1 play. wouldn't it be great if it could do decimals? I'm impatient and will listen to almost all of a track then flick to the next.
So when I go on last fm, my most listened artists are stars of the lid (what i listen to to sleep only sometimes) and massive attack (what i put on when I'm doing some sexing (not inspired i know but it's the easy choice)
I wish last fm worked for me...