A federal judge has dismissed a lawsuit alleging that Google Inc.'s Web search systems infringe on a publisher's copyright. [cut] Judge Surrick's ruling found that Google enjoys projection under an exemption to the Communications Decency Act for online service providers acting as an automatic redistributor of published material.

Reuters via The Unofficial Google Weblog

Don't get this wrong. This is more about Libel law than copyright. Basically, I'm reading that search engines (should include aggregators) are not subject to Libel law for the content they republish.