"Advertising-supported companies have long turned to the courts to squelch products that let consumers block or skip ads: it happened in the famous lawsuit against the VCR in 1979 and again with ReplayTV in 2001."
"Tomorrow's legal fight may be over Web browser add-ons that let people avoid advertisements. These add-ons are growing in functionality and popularity, which has led legal experts we surveyed this week to speculate about when the first lawsuit will be filed.
If ad-blockers become so common that they slice away at publishers' revenues, "I absolutely would expect to see litigation in this area," said John Palfrey, executive director of Harvard Law School's Berkman Center for Internet and Society.
Firefox's Adblock plug-in is probably the most prominent way to configure Web browsers not to display advertisements. It lets users block ads from individual Web sites such as doubleclick.net or through configurable directories, like "/banner". Similar plug-ins are available for Opera, Safari and Microsoft's Internet Explorer."
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Source: C|Net News.com