Venue Hopscotch. The Washington Post reports that "Patent Claims Over Apple's IPod Escalate." From the article:

Singapore-based Creative, the No. 2 seller of digital music players in the world, last month sued Apple in U.S. District Court in Northern California, claiming patent infringement. At the same time, the company asked the U.S. International Trade Commission to bar Apple from importing portable digital media players that Creative claims infringe on its intellectual property.

Apple filed a counterclaim in U.S. District Court for Western Wisconsin and followed that up June 1 with a claim in U.S. District Court for Eastern Texas. In its latest suit, Apple says Creative infringed a number of its patents relating to the software and systems on its mobile music player.

Of course, technically, the claim filed in Wisconsin isn't a counterclaim...