Digital Magazines
http://www.zinio.com/

This Week In Science
http://www.twis.org/

The Future And You
http://www.thefutureandyou.libsyn.com/

http://www.sciencemag.org/

http://www.sciencedaily.com/

http://www.sciencenews.org/

http://www.scientificamerican.com/

http://discovermagazine.com/

http://www.livescience.com/

http://physicsworld.com/

http://www.eurekalert.org/