A bitcoin article hit my Am Law Daily feed months ago: http://www.americanlawyer.com/PubArticleALD.jsp?id=120261442.... Also the ABA Journal: http://www.abajournal.com/magazine/article/some_basic_rules_.... Finally, it's been mentioned several times on Above the Law this year: http://abovethelaw.com/tag/bitcoin. I think these are pretty mainstream sources such that a lawyer would have at least run across the term.