Crypto-Gram is "[a] free monthly newsletter providing summaries, analyses, insights, and commentaries on computer security and cryptography." The best such that I've seen. The most recent issue has a interesting short blurb explaining
why you should ask for a receipt. [Bruce Schneier, Crypto-Gram's writer/publisher doesn't say this; I do.]
Justice (Civil Liberties, so-called Intellectual Property, Privacy & Secrecy); Politics & Government (International, National, State, Local); Humor (Irony & the Funny or Unusual); Science & Technology (Astronomy, Computers, the Internet, e-Voting, Crypto, Physics & Space); Communication (Books, Film, Media, Music & the English Language); Economics (Corporatism & Consumerism); and Items of Purely Personal Note (including Genealogy, Photography, Religion & Spirituality).