Another thing that comes off the top of my head is that one might try to get some groups already interested in this topic (in theory) to read LW and OB. One such group I can think of are LaVeyan Satanists. In theory, it is a religion of rationality (although, in practice, it is rather far from it quite often.. Im just lucky to know a specimen who embodies the theory)... Then again, this might not be an association we want (especially in US.. it would even be rather bad here in Estonia where most of the country is atheistic).. but there should be some other groups who hold rationality as one of their core values but know relatively little about it. These people should be rather easy to get - just by stressing that it is one of their own core values...