This is the authoritative introduction to Lucid Dreaming. Then there's a lot more you can find on the web. Most techniques and applications of lucid dreaming seem to focus on personal development and self-awareness and knowledge.
Though these are great things to pursue, I'm also interested in more practical ways I can use it to 'sleep' more effectively on ideas, improving and coming up with new ones, and overall letting the magic work on problem-solving of my waking-time work. Are there methods to turn it into a tool for speeding up this thought-simmering of the subconscious mind?