In addition to the article on left libertarianism, you can read the following:
Mr. Natural Rights
Liberty, State, and Union: The Political Theory of Thomas Jefferson, Luigi Marco Bassani, Mercer University Press, 277 pages
By Ronald Hamowy
From Sweden to Switzerland, liberals pushing unfettered immigration court a populist backlash
By Theodore Dalrymple
More to be found in the archive.
ComeHomeAmerica.us: Historic and Current Opposition to U.S. Wars and How a Coalition of Citizens from the Political Right and Left Can End American Empire (website)