Get on email lists and actually read them (Codrops is a good resource, there is also CSS Weekly, Javascript Weekly, and many others. I also recommend making time to either attend a conference or watch conference talks at home. Cue up a few on Youtube and spend a few hours watching/discussing with a fellow tech friend.
Most of all, practice -- side projects are key! If you want to learn a new skill, build something using that skill. This will force you to find resources and answers.