Ask HN: Looking for a project management/collaboration service

To my big disappointment I failed to bookmark the service. I'm fairly positive their link was posted in a comment to on a story at y combinator a short while back. The author said something along the lines of: 'I didn't like it at first, but now I can't live without it'.

Their tour video featured a case of an indie record label that went through the process of choosing, restyling and recording youtube bands.

They had a tabbed interface kind of like http://www.cohuman.com/

Sincerely hope anyone can help me out. This might not be the place to ask these kind of things but I figured I'd give it a shot.