From the NYT:
"Maybe they haven’t sued the whole Internet, just a good chunk of it. Polaris IP, a patent firm, has filed a patent infringement suit against Google, Yahoo, Amazon.com, A9.com, Borders, AOL and IAC/InterActiveCorp, which owns Ask.com.
Polaris is the owner of United States Patent No. 6,411,947, for an “Automatic Message Interpretation and Routing System.” It is not entirely clear what the patent covers or how Google, Yahoo, et. al. infringed on it. "