I'm always bewildered by what passes for logic in spam disclaimers, but this one may have set a new standard:

This is not a Spam. We take your email adress from open source!

The spam itself is in English (almost), but advertises a site that is entirely in Russian. Because really, if you've just started a forum about psoriasis for Russian speakers, who better to advertise it to than people who don't speak a word of Russian?

Either the Eastern European propensity for joe-jobs has reached new heights, or the sender's own psoriasis has reached his brain.

Update [18.04.2007] - This looks increasingly like a joe-job, as more recent spams advertising the site take care to stress that the maintainers have 'bulletproof' hosting, as if inviting anti-spammers to try to get them closed down.