http://www.thehappinesstrap.com A site set up by Dr Russ Harris, a leading trainer of ACT, contains lots of free resources and valuable information. (I have been trained by him).
http://contextualpsychology.org The official site for ACT practitioners, again containing lots of free information.
http://www.babcp.com The official site for the British Association of Behavioural and Cognitive Therapists – check accreditation of practitioners and find out more about CBT.
http://www.moodscope.com An invaluable free resource for monitoring your moods and learning how to understand what makes you feel better or worse.