My friend Christo sent me this today, and I felt it was worth reposting (one of these days I'll get off my ass and actually design him a blog or something):
Whenever you hire anyone to work for you, go to the local store, book shop, whatever... you might start to ask about their feelings about policy issues. If they are more or less in line with you, go ahead and give them the $$ patronage. Otherwise, find someone else to provide the same service in the future.