Microsoft Certified Professional Magazine is directly targeted at those certified by Microsoft: www.mcpmag.com
Certification Magazine specializes in information for IT certified individuals: www.certmag.com
Windows IT Pro Magazine focuses specifically on Microsoft technologies: http://www.windowsitpro.com/
Training Mag is a resource for professional training and development: http://www.trainingmag.com/training/index.jsp
Computer magazine is developed by the Institute of Electrical and Electronics Engineers (IEEE): http://www.computer.org/portal/site/computer/index.jsp
PC Magazine is a staple for technology enthusiasts: www.pcmag.com