Circuit Cellar: http://circuitcellar.com/
Circuit Cellar's mission is to collect, select, and disseminate need-to-know information around the world in the fields of embedded hardware, embedded software, and computer applications.
Elektor breaks the constraints of a magazine. It's a community of active e-engineers - from novices to professionals - eager to learn, make, design and share surprising electronics.
Everyday Practical Electronics (EPE): http://www.epemag.com/
EPE is the No. 1 UK magazine for hobby electronics enthusiasts everywhere.
Nuts & Volts: http://www.nutsvolts.com/
Nuts & Volts is written for the hands-on hobbyist, design engineer, technician, and experimenter.