A Schneier blog post notes that three would-be bombers were recently convicted in the UK thanks in large part to e-mail communication that was intercepted by the US National Security Agency. This was the second time the men had faced criminal charges; in the first trial, the prosecution was unable to make part of their case because they didn't yet have the e-mail evidence. "Although British prosecutors were eager to use the e-mails in their second trial against the three plotters, British courts prohibit the use of evidence obtained through interception. So last January, a US court issued warrants directly to Yahoo to hand over the same correspondence." The BBC posted a number of e-mails used as evidence in the trial. The communication is coded, and some of it looks like what you might find in your spam folder, but the article also provides the prosecution's explanation of what they mean.