I'm a frequenter of the New Thread 2.0 and constantly stay updated to keep on top of the songs available. I download as much music as (pleasing to my ear) possible.
I usually browse through all songs and find the new songs that way, but you notice as you preview songs that it takes longer and longer to get through due to songs trying to load as you're going past them.
It would be great if once you decided you didn't want to purchase a song, you could hide it so it wouldn't clutter up the browsing list and you would have a better idea of what's new.
There are probably crazy specifics to work with, but it would be worth it, I believe.
I would use this feature every week and if I'm firm on not buying the songs, I don't really need to see them anymore. I don't change my mind when it comes to selection of what I want to play. And if I ever did, an unhide option would take care of that.