How many fronts does one war need?

From the Associated Press via the Washington Post:

BAGRAM AIR BASE, Afghanistan -- Asserting a right to self-defense, American forces in eastern Afghanistan have launched artillery rounds into Pakistan to strike Taliban fighters who attack remote U.S. outposts, the commander of U.S. forces in the region said Sunday.

The skirmishes are politically sensitive because Pakistan's government, regarded by the Bush administration as an important ally against Islamic extremists, has denied that it allows U.S. forces to strike inside its territory.

Hmm. "Asserting a right to self-defense". They wouldn't be looking for a precedent to exploit re Iran would they?