Ones that occur to me include:

• Gordon v. Virtumundo (9th circuit sets very high bar to CAN SPAM standing)
• Omega World v. Mummagraphics (falsity must be material)
• White Buffalo Ventures v. University of Texas at Austin (OK per 1st amendment for government to filter when acting as ISP rather than regulator)
• Intel v. Hamidi (spam is not trespass without real damages)
• Asis v. Optin Global/Azoogle (courts don't like sloppy serial plaintiffs)
• Pallorium v. Jared (CDA protects anti-spam blacklists, state court version)
• e360 v. Comcast (CDA protects spam filtering in general, federal court)
• Cyberpromo v. AOL (old, but still the case that says there's no 1st amendment right to have e-mail delivered)

What else should I include?