I checked out a UK site about Master Yu and did some perusing. Interesting. the site says a book/cd is being released at some point.
Interestingly, a few weeks ago while searching I came across a yoga article that talked of practice of affirmation and visualization as spiritual practice. Interesting.
Also, this form of buddhism Master Yu is associated with is actually originally from Indian yoga lineages.
I think the native american lineage has similar practices to some degree...there may be a link there. The compass points eastward.