Hi,
browsing my autodetected spam folder, I came across a couple of messages from Randy Cassingham's 'This is True' newsletter (see http://thisistrue.com) that hit on SURBL lists..
Randy uses plain text advertising within is bulletin but he's not a spammer... in fact he wrote and maintains a 'spam primer' page at http://www.spamprimer.com/
The domains that hit this where: REMOVETHIS-JumboJoke.com and REMOVETHIS-BonzerSites.com (in outblaze's list) and REMOVETHIS-HealthYouDeserve.com (in Bill's list).