Profiler from Psychic Blogger Chic has described her telepathy and aura reading at parties. In her post "I Can Hear What You Are Thinking" she describes what thoughts she hears at parties and more about aura reading. She provides some entry level information into aura reading: simple exercises to develop it and some introduction of what can be on the aura and how to interpret it. Here’s a short quote:

At parties, I start with the aura – the energy field around the person. There are many signs that can be read in the aura, the color, shape, vibration, holes or dark spots, faces – just about anything could show up. If you want to read auras, all you need to do is to train your eyes to see beyond what is in front of you.

The are a lot of textbooks on aura readings. One of the best, in my opinion is  Hands of Light : A Guide to Healing Through the Human Energy Field by Barbara Ann Brennan.