Google has reportedly sought out the assistance of the National Security Agency (NSA) in tracking down the hackers who recently infiltrated the search engine giant's e-mail and business accounts. Although this sounds like an unusual step, it's representative of a rather common–although generally not divulged–form of collaboration between private computer security firms and the NSA that has gone on for years.
Security researchers have mentioned such cooperative efforts to me in the past, so it hardly seems newsworthy now. However, the ongoing digital skirmishes do seem to be increasing. Moreover, the current economic climate (cloudy with a chance of tsunami) has raised the stakes. In other words, it's all fun and asymmetric warfare until someone loses their shirt.
For more on the international cyber shenanigans, read "CyberSpy vs. CyberSpy."