I’m going to follow Eugene Volokh’s lead and put in a good word for the Institute for Justice.
The Institute for Justice is a civil liberties public interest law firm that focuses largely on those areas of most interest to libertarians (e.g. property rights, free speech, school choice, etc.) As their website describes their work:
Simply put, we sue the government when it stands in the way of people trying to earn an honest living, when it unconstitutionally takes away individuals’ property, when bureaucrats instead of parents dictate the education of children, and when government stifles speech. We seek a rule of law under which individuals can control their destinies as free and responsible members of society.
If these are things you believe are worth supporting, then I urge you to support the Institute for Justice, as I do.
Also, if you are as outraged by the recent Kelo decision as I am, you might consider giving particular support to their Castle Coalition project which focuses on eminent domain abuse in particular.