I've been using the Byron Katie stuff recently and it is really helping me sort through my beliefs and stuff. I didnt realise how many thoughts I have that are clearly affecting reality. I am sometimes barely aware of them or they manifest in my mind as daydreams (its like the daydreams are the effects of a belief and when you enquire into what they represent there is a sold belief that can be expressed as a sentence).
Check it out...
ByronKatie.com: The Official Blog for The Work of Byron Katie
and...
The Work of Byron Katie - Byron Katie International