The purpose of raising Kundalini is to become one with the Cosmic Consciousness in Universal Bliss or your God/Goddess.
The dangers arise when people try to raise Kundalini because of the pleasurable sensations or high that can sometimes come with it. When you experience a Kundalini Awakening, you will notice that you have high and low energy times. This commonly happens as the Kundalini works through blockages as it moves up the Chakras. When you keep pushing the Kundalini to rise, more symptoms can arise. Some symptoms may not be pleasurable or cause sickness. If you get sick or feel pain, stop your Kundalini raising techniques. Allow the energy to lessen in strength and let it flow naturally.
I had made meditation part of my daily routine but currently I am unable to do so. Every time I do, I will get a bad headache the next day. This means my Kundalini is very active and I do not need to meditate now. Meditation actually helps to raise your consciousness.
Another danger is when people raise their Kundalini because they want to experience Siddhis (http://en.wikipedia.org/wiki/Siddhi) or have special psychic abilities. I recently went to a website that was suppose to be a network for people experiencing Kundalini Awakening. One of its links show a man in a video that is using his spiritual energy to push a man forward and then back. I personally feels this takes away from the real purpose of raising Kundalini. Yes, being able to read minds or possibly levitate is great but that is nothing in comparison to becoming one with the Universal Source!
Keep your eye on the bigger prize!