guest blog dead

I'm curious if guest posting is still effective. I've been away from link-building for quite some time. Could you please share some statistics, studies, or case studies about guest posting and its outcomes? And what are your thoughts, is it working or not?

---- THREAD CLOSED 01/21/2014 ---- I honestly don't think its dying just has to be done in the proper niche for it to be relevant. What do you think? Sourcehttp://www.mattcutts.com/blog/guest-blogging/