What recourse have we?

Since 2 March 2009, a number of formerly classified memoranda from W's DoJ have been released, revealing DoJ determinations that...

... US Can Conduct Warrantless Surveillance against Citizens
... Bush Has Power to Order Military Strikes inside US
... Bush Can Unilaterally Amend ABM Treaty with Russia
... Bush Can Order Rendition of Detainees without Congressional Approval
... Congress Has No Power to Interfere with President’s Wartime Powers
... US Military Can Indefinitely Detain US Citizen without Due Process

... and that torture is okay:

Bybee memo, 1 Aug 2002
Bradbury memo, 10 May 2005
Bradbury memo, 30 may 2005

As Scott Horton argues in George W. Bush’s Disposable Constitution,

We may not have realized it at the time, but in the period from late 2001-January 19, 2009, this country was a dictatorship.

What recourse have We, the people of the United States, against this abuse of power?

Federal courts have held that to have standing to bring suit in warrantless wiretapping cases, the plaintiff must have positive evidence that he was, in fact, the subject of illegal surveillance. This is a very high hurdle to leap!

The First Amendment guarantees,

Congress shall make no law... abridging... the right of the people ... to petition the government for a redress of grievances.
[First Amendment]

... BUT - how exactly is this right to petition for redress of grievances to be exercised in practice?

The current Administration seems less-than-anxious to pursue criminal investigations against members of the former Administration for abuse of power.
Congressional leaders seem similarly loathe to hold anyone to account for the well-documented egregious abuses of W & his enablers.

What recourse have we when the Executive deliberately, systematically usurps & abuses power?