Finally, but given the degree to which the State Department has sabotaged this investigation from the beginning, I do not expect any indictments to come of it.

Update: We now have reports that the Gand Jury is investigating other Mercenaries Security Contractors in addition to Blackwater:

The Washington grand jury has issued subpoenas to several private security firms, including Blackwater, a legal source briefed on the probe said yesterday. Authorities are seeking company “after-action” reports and other documents that may shed light on specific incidents, he said.

The source, speaking on the condition of anonymity because of the sensitivity of the probe, declined to say which incidents have been targeted, but he said the investigation ranges well beyond Blackwater. Private security companies in Iraq “have been shooting a lot of people,” he said.

Emphasis mine.

I think that if there is ever a fair accounting of the actions of the mercs in Iraq, a lot of people are going to be called to account.