This is a very dynamic start-up. Two weeks ago they announced they changed their brand from thesixtyone to thesixtynine, because they thought it would be more memorable. (See http://thesixtyone.tumblr.com/post/91817637/reinventing-the-...) It looked kinda odd, having a "69" icon in my bookmarks toolbar.

Anyway, they appeared to have returned to the old brand now. Great site, though :)