Non-fiction
The Artist's Way - Cameron, JuliaHighly Recommended - 12 week course in "discovering and recovering your Creative Self". WARNING - May do serious damage to your creative blocks!
Impro - Johnstone, Keith
Seminal work on creativity.
Story - McKee, Robert
A tome of a book but worth the read. Philosophical, historical and practical guide to screen-writing but may also be of use to other forms of creative writing.
Save the Cat - Blake Snyder
A structured approach to screen-writing. If McKee's "Story" gives you the principles then this book gives you a simple structure to apply them to. Easy, entertaining read.
Through the Body - Dymphna Callery
A primer for Physical Theatre. A secondary text to a subject that has no definitive primary text.
A woman in your own right - Dickson, Anne
Enlightening book on communication and helpful for more assertive living. Female-focused.
Theatre of the Oppressed - Boal, Augusto
Games for Actors and Non-Actors - Boal, Augusto