Back in August I mentioned a new anti-spam tool called Habeas. This utility places a trademarked haiku poem into an e-mail header, which allows the e-mail to pass through spam filters unmolested. This week, Habeas filed suit against five entities that allegedly used the trademarked poem without permission. CNet has more on the lawsuits.
These lawsuits will be the first attack on spam using trademark law, so it will be interesting to see what happens.