U.S. Tries to Make It Easier to Wiretap the Internet - NYTimes.com:

Essentially, officials want Congress to require all services that enable communications — including encrypted e-mail transmitters like BlackBerry, social networking Web sites like Facebook and software that allows direct “peer to peer” messaging like Skype — to be technically capable of complying if served with a wiretap order. The mandate would include being able to intercept and unscramble encrypted messages.

Note how this is written as if the only people doing message scrambling/encrypting are ISPs. I've been wanting to write a mail handler that made encryption easy (and, at least initially, it's only job). I need to write it sooner than later.

(Which reminds me, tried encrypting with Thunderbird? Sheesh, non-intuitive. It's all about barriers to entry, Gladwells.)