TCS Webs presents a list of links to major online resources engaging with current concepts in theory:
Critical Inquiry, http://criticalinquiry.uchicago.edu/
ctheory, http://ctheory.net/
Culture Machine, http://www.culturemachine.net/index.php/cm
Cultural Theory, Cultural Studies, http://www.cs.cmu.edu/afs/cs.cmu.edu/user/phoebe/mosaic/cultural-studies.html
Fragment.nl, http://fragment.nl/resources/
gnovis, http://gnovisjournal.org/
Identities, http://www.tandf.co.uk/journals/titles/1070289x.asp
Journal for Cultural Research, http://www.tandf.co.uk/journals/titles/14797585.asp
London Review of Books, http://www.lrb.co.uk/
Multitudes, http://multitudes.samizdat.net/
New Formations, http://www.lwbooks.co.uk/journals/newformations/contents.html
New York Review of Books, http://www.nybooks.com/
Public Culture, http://www.publicculture.org/
Space and Culture, http://www.spaceandculture.org/about-the-journal/
Telos, http://www.telospress.com/
Theory and Event, http://muse.jhu.edu/journals/theory_&_event/