you to some of my reading list that prompted that post.
Below is the list of some online magazines that are available for free  
related to engineering, aerospace, and aviation. I am a regular reader  
of these and the list goes on increasing.
ANSYS Advantage
ANSYS Advantage, the award-winning magazine about excellence in  
engineering simulation, showcases a broad range of engineering  
simulation capabilities through in-depth articles authored by industry  
and ANSYS specialists  http://www.ansys.com/About+ANSYS/ANSYS+Advantage+Magazine/Current+Issue
Aerospace America
Aerospace America is exclusive to AIAA members but archives are  
available. Check them out http://www.aerospaceamerica.org/Pages/Archives.aspx
AERO magazine is published quarterly by Boeing Commercial Airplanes  
and is distributed at no cost to operators of Boeing commercial  
airplanes. AERO provides operators with supplemental technical  
information to promote continuous safety and efficiency in their daily  
fleet operations. http://www.boeing.com/commercial/aeromagazine/
FAST from airbus
 From flight testing to instruments, from aircrafts to engineering  
support, it covers all. http://www.airbus.com/support/publications/
The Aero Magazine
The Aero Magazine is issued twice a year. If you're interested in  
aviation, it's a magazine for you.
http://www.volvoaero.com/VOLVOAERO/GLOBAL/EN-GB/NEWSMEDIA/PUBLICATIONS/PAGES/PUBLICATIONS.ASPX
Online Magazine from Rolls-Royce.
Not much to read but go there for cool wallpaper downloads.
http://www.rolls-royce.com/about/publications/magazine/index.jsp
Lectures from the Royal Aeronautical Society's Online Media Channel.  
Great stuff. Absolute must if you want to listen to top aerospace  
experts speak. http://www.aerosocietychannel.com/s/all-lectures/
Aeromag
Indian specific aerospace news magazine.
http://www.aeromag.in/
Other mentions
http://www.flightjournal.com/
If you know of any other publication,  please do add to the list.
Cheers