Findings:

• subspace spam
• Spam Mocking
• SPAM® and eggs
• Spam (user)
• Spam
• Rack of Spam
• explicit colloborative filtering
• Hot & Spicy Spam
• spam fritter
• Anti-spam spam
• Spam Dragon (user)
• Spam Fighting 101
• Citizens Against Ugly Street Spam
• automated gene pool filtering mechanism
• Chinese Spam
• procmail recipe to drop (forged) Hotmail spam
• I like spam
• air filtering plants
• Spam email
• Spam Musubi
• A solution to spam (which doesn't work, but nice try)
• spam bait
• How to use Google to bypass server side filtering
• War on Spam
• Spam haiku
• Pop-ups and spam
• HTML filtering
• Spam Armor
• bilinear filtering
• Spam bomb
• Spam Spread
• spam folder
• collaborative filtering
• Spam Cannon (superdoc)
• URL filtering
• The difference between Tofu and Spam
• Spam Titles featuring Sexual Enhancement products
• filtering software
• How to defeat content filtering services
• Analyzing spam: A journey into conspiracy theory and steganography
• Spam filter
• @ spam
• Content filtering
• Spam and Corn
• avoiding spam email
• spam as found poetry
• implicit collaborative filtering

If you Log in you could create a "spam filtering" node. If you don't already have an account, you can register here.