I love the learning conferences, and ATD TK is one of my favorites. Having the opportunity to speak there about mobile learning was a great experience and we received a lot of good, valuable feedback.
I had a several people ask me to post the slides, so here they are: Your learners are mobile. Are you keeping up?
Also, as I mentioned in my talk, I follow several thought leaders and find their content both extremely useful and inspirational. Check out Chad Udell of Float learning, and Clark Quinn of Quinnovation.