So far, I'm not seeing concrete results, but I'm using LinkedIn a lot and learning a lot from that and making some connections.
My "Other" is MediaBistro.com. I get nibbles now and then, and I find their articles engaging and helpful. Job matches for both MB and LinkedIn are hit-or-miss, but I've applied for a few positions via both.
I AM seeing more activity on my LI profile in recent weeks, which is a good sign.