This ruling is huge.
Ever since I first got involved in fighting the RIAA's litigation campaign, and blogging about it, in 2005 [that's almost 8 years ago] I've been arguing that it is not a sufficient basis to bring a lawsuit against someone that an internet access account for which he or she pays the bill was used by someone for a copyright infringement. Even though I, and lots of other lawyers, and lots of other techies, and lots of other people from all walks of life knew this, I have never -- until this ruling -- seen a JUDGE dismiss a complaint because of this.
If those of you who are saying this is "not a big deal" or "was expected" know of any prior decisions like this, please show them to me. Otherwise, STFU about it not being big. After about 10 years and hundreds of thousands of frivolous lawsuits, finally a judge has pointed out that the Emperor is wearing no clothes.
It is one of the most newsworthy copyright posts I have ever seen on Slashdot.